“Genital Reassignment on Two Male Transvestites”, Felix Abraham, in International Journal of Transgenderism 2,1 (1997); Originally published as: “Genitalumwandlungen an zwei männlichen Transvestiten”; Zeitschrift für Sexualwissenschaft und Sexualpolitik, 18: 223-226 (1931).
With three photographs; article transcribed on www.atria.nl
Report of two of the earliest genital reassignments, performed on Rudolph/Dora (named Dorchen by Magnus Hirschfeld) and Arno/Toni.
(1931) Felix Abraham – Genital Reassignment on Two Male Transvestites (pdf).