"An annual publication of the Scientific-Humanitarian Committee (Wissenschaftlich-humanitäres Komitee, WhK), an early LGBT rights organization founded by Magnus Hirschfeld in 1897. The periodical featured articles on scientific, literary, and political topics related to sexual and gender minorities. It was published regularly from 1899 to 1923 (sometimes quarterly) and more sporadically until 1933.^{[1]" (Wikipedia)}  

Hirschfeld's institute was closed by the Nazis in 1933; they also destroyed the research library of his institute. 

"Third sex" was Hirschfeld's provisional term for gays and lesbians. Translated into English by James J. Conway as Berlin's third sex, Berlin: Rixdorf Editions, 2017.

Sexuality in World War I. Abridged translation into English Sexual History of the World War (New York, Panurge Press, 1934). Only a small sampling of the plates from the German edition were issued as Illustrated Supplement to The Sexual History of the World War (New York: Panurge Press, n.d).