According to the Groff website <https://www.gnu.org/software/groff/>, Harding is the User Issues Lead and his email is <ted.hard...@nessie.mcc.ac.uk>. Perhaps he may have the original source?
KB On Thu, Jun 10, 2021 at 11:46:09AM -0400, T. Kurt Bond wrote: > The only place I've been able to find the PDF of Ted Harding's "A Guide to > Typesetting Mathematics using GNU eqn" (the link from troff.org is broken) > is in the archives of the groff mailing list: > > https://lists.gnu.org/archive/html/groff/2013-10/pdfTyBN2VWR1c.pdf > > Does anyone know of the source to this was ever released? > -- > T. Kurt Bond, tkurtb...@gmail.com, https://tkurtbond.github.io