MUDD E10 N21mi copy 1: With typewritten letter of invitation inside front cover, addressed to Miss Jane W. Hill of New Haven, Conn., dated Jan. 31, 1941. Signature of Secretary of the society. Covers detached.
MUDD E10 N21mi copy 2: With typewritten letter of invitation inside front cover, addressed to Prof. Richard S. Kirby of New Haven, Conn., dated Feb. 3, 1941. Signature of Secretary of the society. Does not have fold map. Back cover detached.
MUDD E10 N21mi copy 3: With typewritten letter of invitation inside front cover, addressed to Mr. Samuel Thorne, Jr., of New Haven, Conn., dated Mar. 17, 1941. Signature of Secretary of the society. Does not have fold map. Includes application for membership slip.