Die Transvestiten: Eine Untersuchung über den Erotischen Verkleidungstrieb is a classic 1910 book on crossdressing and transvestism that was written by German sexologist Magnus Hirschfeld.
[7] Subsequent to its publication, the book was translated into English with the title Transvestites: The Erotic Drive to Cross-Dress by Michael Lombardi-Nash in 1991.
[10] While the book is about crossdressing, it also clearly includes some people with cross-gender feelings who would likely be referred to as transgender today.
[10] Die Transvestiten includes first-person narratives of crossdressing, Hirschfeld's commentaries on these cases, and theorizing based on the observations.
[1] In the book, Hirschfeld wished to distinguish transvestism and transgenderism from other forms of sexual and/or gender variance, like homosexuality and paraphilias like fetishism and sadomasochism.