US aircraft attacking submarines along US Paicifc coast line according to the U.S. Joint Intelligence Committee. Daily summary dated 31 December 1941

An item reported that US aircraft bombed with unknown results three possible enemy submarines in the afternoon of 29 December in the area between Eureka, California-Astoria/mouth of the Columbia river, Oregon, USA.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 21 dated 31 December 1942