Per Blair of Algol's request, here's OD&D Supplement III, gorgonized. Check out more of Russian artist Ule-Kuole's work here. The piece used on the cover originally appeared on the LP version of Blackdeath's Vortex album. As for my chop-job on Frazetta's "Sacrifice" on the back -- I always imagined that it was the inspiration for Eldritch Wizardry's original cover [see here], but as it turns out Frazetta painted "Sacrifice" in 1980 -- four years after Supplement III was published. So much for my theory.