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Transmission towers in the switchyard of TVA's Chickamauga Dam, near Chattanooga, Tenn.

Transmission towers in the switchyard of TVA's Chickamauga Dam, near Chattanooga, Tenn.

Transmission towers in the switchyard of TVA's Chickamauga Dam, near Chattanooga, Tenn

Transmission towers in the switchyard of TVA's Chickamauga Dam, near Chattanooga, Tenn

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Knox County, Tennessee (Tennessee Valley Authority (TVA)). Transmission towers on farmland

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Watts Bar Dam, Tennessee. Tennessee Valley Authority. Transmission towers

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Knox County, Tennessee (Tennessee Valley Authority (TVA)). Transmission towers on farmland

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Wheeler Dam, Alabama (Tennessee Valley Authority (TVA)). Transmission towers

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Wheeler Dam, Alabama (Tennessee Valley Authority (TVA)). Transmission towers

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Production. Magnesium. A veritable forest of transmission towers and transformers distribute electrical power to the various units of Basic Magnesium's huge plant in the southern Nevada desert. Some units of this plant are now producing magnesium, lightest of all metals, for incendiary bombs, tracer bullets and aircraft parts. Full production is scheduled for the summer of 1943

Production. Magnesium. A veritable forest of transmission towers and transformers distribute electrical power to the various units of Basic Magnesium's huge plant in the southern Nevada desert. Some units of this plant are now producing magnesium, lightest of all metals, for incendiary bombs, tracer bullets and aircraft parts. Full production is scheduled for the summer of 1943

Production. Magnesium. A veritable forest of transmission towers and transformers distribute electrical power to the various units of Basic Magnesium's huge plant in the southern Nevada desert. Some units of this plant are now producing magnesium, lightest of all metals, for incendiary bombs, tracer bullets and aircraft parts. Full production is scheduled for the summer of 1943

Production. Magnesium. A veritable forest of transmission towers and transformers distribute electrical power to the various units of Basic Magnesium's huge plant in the southern Nevada desert. Some units of this plant are now producing magnesium, lightest of all metals, for incendiary bombs, tracer bullets and aircraft parts. Full production is scheduled for the summer of 1943

Procession of electrical transmission towers in Van Zandt County in northeast Texas

Procession of electrical transmission towers in Van Zandt County in northeast Texas

Pennsylvania-New Jersey Interconnection Bushkill to Roseland Transmission Line, From Roseland Borough, Essex County, through Morris County and Sussex County to Hardwick Township, Warren County, Roseland, Essex County, NJ

Pennsylvania-New Jersey Interconnection Bushkill to Roseland Transmission Line, From Roseland Borough, Essex County, through Morris County and Sussex County to Hardwick Township, Warren County, Roseland, Essex County, NJ

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

La Bajada Historic Trails and Roads, Approximately 1 mile East/Northeast of intersection of State Highway 16 and Indian Service Road 841, La Bajada, Santa Fe County, NM

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highway 93, Boulder City, Clark County, NV

Naval Computer & Telecommunications Area Master Station, Eastern Pacific, Radio Transmitter Facility Lualualei, Helix House No. 2, Base of Radio Antenna Structure No. 427, Makaha, Honolulu County, HI

Naval Computer & Telecommunications Area Master Station, Eastern Pacific, Radio Transmitter Facility Lualualei, Helix House No. 2, Base of Radio Antenna Structure No. 427, Makaha, Honolulu County, HI

Naval Computer & Telecommunications Area Master Station, Eastern Pacific, Radio Transmitter Facility Lualualei, Helix House No. 2, Base of Radio Antenna Structure No. 427, Makaha, Honolulu County, HI

Naval Computer & Telecommunications Area Master Station, Eastern Pacific, Radio Transmitter Facility Lualualei, Helix House No. 2, Base of Radio Antenna Structure No. 427, Makaha, Honolulu County, HI

Naval Computer & Telecommunications Area Master Station, Eastern Pacific, Radio Transmitter Facility Lualualei, Helix House No. 2, Base of Radio Antenna Structure No. 427, Makaha, Honolulu County, HI

Naval Computer & Telecommunications Area Master Station, Eastern Pacific, Radio Transmitter Facility Lualualei, Helix House No. 2, Base of Radio Antenna Structure No. 427, Makaha, Honolulu County, HI

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