Service Building No. 620. Detail of north elevation and entrance to substation and windowns in top of elevator shafts no. 2 and stair no. 1 and section thru substation (dry dock associates, June 12, 1941). In files of Cushman and Wakefield, building 501, Philadelphia Naval Business Center. - Naval Base Philadelphia-Philadelphia Naval Shipyard, Service Building, Dry Docks No. 4 and 5, League Island, Philadelphia, Philadelphia County, PA

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