Kartenlesen Brosch.90 

s. 
~ap-and-aerial-photograph-reading elementary 
-Elementary },!ap and<f?arial Photograph 
Reading. Prepared under dir. of tbe Chief 
of Ellgineers. [I11u::;tr. Nebst 3 Beil.: 
C 1-3.] -Washington 1941: U.S.Printing 
Off. 100 S., 1 Kt. gef. 
(War Department. Basic Field lIanual. 21-25.