https://www.m3.org/
https://www.research.digital.com/SRC/modula-3/html/home.html
https://www.cs.columbia.edu/graphics/modula3/tutorial/www/m3_toc.html
https://www.vlsi.polymtl.ca/m3/
https://www.cl.cam.ac.uk/m3doc/
https://www.cmass.com/threads/
usenet newsgroup: comp.lang.modula3
All listings referred to in this article are available by anonymous download in the file
ftp://ftp.ssc.com/lj/listings/issue49/2690.tgz.