A lot of work I've been doing recently has been around the emergence of various gender identities. "Neutrois" recently came to my attention, with more information about it here:
Most (if not all) of these sources claim that a person by the name of H. A. Burnham coined the term to refer to hirself (preferred pronoun) in 1995.
However, the earliest source I could find on this was an archived version of Netrois.com (then known as Neutrois Outpost) from 30 August 2000. The earliest archived version of the FAQ that states Burnham's coinage is from 7 March 2001.
I've checked HathiTrust, Google Books, and Newspapers.com so far and can't seem to find anything, so any pointers to sources to check would be very much appreciated! Additionally, any info on who Burnham was/is would be great too! I'd love to give credit where credit is due!
EDIT 1: So it seems that "H. A. Burnham" is "Holly A. Burnham" based on some Usenet posts in alt.transgendered (https://groups.google.com/forum/?hl=en#!searchin/alt.transgendered/%22neutrois%22%7Csort:date). The earliest attribution I can find seems to be December 1996 though...