18331. Sketch plan of Pei-Hai
United States, Department of State., Interim Research and Intelligence Service., Research and Analysis Branch. and United States, War Department., Strategic Services Unit., Reproduction Branch. R & A, IRIS. "No. 3638." "29 December 1945." "Free." "Data compiled prior to 1 August 1945. Date of information unknown.". Lithographed in the Reproduction Branch, SSU.