The ports of Puerto Rico /
prepared by the Board of Engineers for Rivers and Harbors, War Department.

APA Citation

United States. Board of Engineers for Rivers and Harbors., United States. Army. Corps of Engineers. (1935). The ports of Puerto Rico. Rev. ed. Washington: G.P.O..

MLA Citation

United States. Board of Engineers for Rivers and Harbors, and United States. Army. Corps of Engineers. The Ports of Puerto Rico. Rev. ed. Washington: G.P.O., 1935.