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Maintenance being done on the USS Potomac (AT-50) in Dry Dock No. 1 of League Island (Philadelphia Naval Yard) in 1907. 6½ x 8½ inch glass negative. View full size.
That one building survives, but seems to have gone topless:
Technically, at the time, Potomac was Fleet Tug No. 50. The Navy began using the two-letter prefix in 1920. The tug almost made 100, being scrapped in 1982.
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