Japanese submarine facilities along Mexican west coast according to the U.S. Joint Intelligence Committee. Daily summary dated 1 January 1942

An item referred to several unconfirmed reports of supply and radio facilities on the Mexican west coast and outlying islands which were available for Japanese submarines.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 22 dated 1 January 1942