Headquarters Space Divison Department Of The Air Force

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More

Significance: The Trona Plant (Building 425) at Fort MacArthur is one of the largest remaining wood timber buildings in southern California. As such, it represents an impressive example of an early west coast More