File:Philadelphia naval shipyard drydock plan 1848 cropped.jpg
Philadelphia naval shipyard drydock plan 1848 cropped.jpg
Gatoclass uploaded a new version of File:Philadelphia naval shipyard drydock plan 1848 cropped.jpg Removed artefacting in lower lefthand corner with additional crop.
http://commons.wikimedia.org/wiki/File:Philadelphia_naval_shipyard_drydock_plan_1848_cropped.jpg