Posted by Doc Dave [70.208.141.55] on Friday, April 18, 2014 at 05:53:40 :
In Reply to: O.T. "tactical maps" posted by Sherman in Idaho [72.47.153.28] on Friday, April 18, 2014 at 02:25:03 :
I wonder if it they were made as part of a wartime defensive measure. There was, early in the War, a genuine concern of a Japanese invasion of the western U.S.
So the Survey could have supplied these for the Corps.