Whoa, dude. This was also used as the cover for US Southern-punk-metal band Hookers, on their 2001 release "Equinox Beyond Tomorrow Volume One":
No attribution in the liner notes, tsk tsk. When I got the CD, I had the feeling it was some kind of HPL thing. The farmhouse and goat attributes should have guided me towards "The Dunwich Horror"... Thanks for posting, all three of those are excellent!