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There were a number of good Lovecraft adaptations in the underground SKULL COMICS in 1971-1972, issues 4-5 (and issue 6 is an original story, but in the Lovecraft flavor).
SKULL COMICS issues 1-3 are more underground-ish, with sex, drugs and hippies, but also capture and are tribute to the unrestrained 1950's E C horror comics. I like the more sophisticated turn the series took in issues 4-6. With some nice art on multiple Lovecraft stories, from an unholy host of underground artists, including Spain Rodrigues, Jaxon, Corben, Sheridan, Dallas, and Dietch.
https://viewcomiconline.com/skull-comics-4/Two more underground series that ran concurrent with SKULL COMICS in the 1970-1972 period:
FANTAGOR 1-4, and a much later 5th magazine-size issue published in 1983
https://viewcomiconline.com/fantagor-issue-1/Richard Corben's self-published underground, with an E.C. style host chaqracter "Gurgy Tate" introducing the stories.
I especially like the opening and closing splash pages of the two-headed Fantagor and Gurgy Tate in issue 5.
Issue 1 is black and white, issue 2 is partial color, and 3 and 4 are full color. Issue 5 is partial color, and I think black and white works better on the horror stories presented.
And
GRIM WIT, the other E.C.-styled underground horror book by Corben from that period, hosted by Horrilor
https://www.mycomicshop.com/search?TID=573741These issues aren't online to read yet. There's a back cover house ad/poster on issue 2 that shows all 3 E.C.-styled horror hosts in one ad together, promoting the whole line.
Corben also did intro splash pages of another host character in
WEIRDOM COMIX 14 and 15, more of a sexy Vampirella-type host character.
https://www.mycomicshop.com/search?TID=23512857In 1973, Corben began doing work for Warren in CREEPY, EERIE, and VAMPIRELLA, and at that point his underground work mostly stopped.
A CORBEN SPECIAL, released in 1984 by Pacific Comic, is a pleasant addition, reminiscent of Corben's work on all these earlier horror/gothic offerings, adapting Edgar Allen Poe's "The Fall of the House of Usher"
https://viewcomiconline.com/a-corben-special-full/