"Read with despatch 649 of July 30, 1938 from Amer. Leg'n, Asuncion, Paraguay. DCR 724.34119/1555" -- hand written (part of photocopy) in bottom margin.
Bares the "Office of the Geographer, Sep 20, 1938 Department of State" stamp (part of photocopy).
Also available on the Internet through the American Geographical Society Library Digital Map Collection.