Ports on the Delaware River below and above Philadelphia, Pa. /
prepared by the Board of Engineers for Rivers and Harbors, War Department and Division of Research, United States Maritime Commission.

APA Citation

United States. Maritime Commission. Division of Research., United States. Board of Engineers for Rivers and Harbors. (1938). Ports on the Delaware River below and above Philadelphia, Pa.. Rev. 1938. Washington: For sale by the Supt. of Docs., U.S. G.P.O..

MLA Citation

United States. Maritime Commission. Division of Research, and United States. Board of Engineers for Rivers and Harbors. Ports On the Delaware River Below And Above Philadelphia, Pa.. Rev. 1938. Washington: For sale by the Supt. of Docs., U.S. G.P.O., 1938.