Hammerhead Crane - Philadelphia Navy Yard - 1975/1995

http://www.loc.gov/pictures/item/pa3416.photos.359950p/resource/

http://www.loc.gov/pictures/item/pa3416.photos.359949p/

http://www.loc.gov/pictures/item/pa3416.photos.359951p/

http://www.loc.gov/pictures/item/pa3416.photos.359966p/

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