https://asc-cybernetics.org/publications/Texts_in_Cybernetic_Theory.pdf
pdf dug up by @Kihbernetics who says:
Found this really interesting document from 1988 with texts from #Powers, #Maturana, and #Glasersfeld, but it is missing two pages (30 and 31) in the “outline of control theory” from Powers. If someone has the full text it would be very much appreciated. https://asc-cybernetics.org/publications/Texts_in_Cybernetic_Theory.pdf