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christopher h marston

civil actions

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dams

dean herrin

eric n delony

greene county

harrold and mcdonald

historic american engineering record

milnor roberts

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Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, Greensboro, Greene County, PA

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...

Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, Greensboro, Greene County, PA

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...

Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, Greensboro, Greene County, PA

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...

Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, Greensboro, Greene County, PA

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...

Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, Greensboro, Greene County, PA

Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...

Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More