I've come to realize over the last 2 or 3 years what an enormous contribution to the comics field amateur fanzines injected into the field in the 1960's and 1970's. The sophisticated sci-fi/pulp style design of these fanzines, the articles, the character histories, and the beautiful covers and artist portfolios, were something that carried over into magazines like SAVAGE TALES and SAVAGE SWORD OF CONAN.

The first and best for a long time was ROCKETS BLAST COMIC COLLECTOR
https://www.mycomicshop.com/search?tid=448361&pgi=51

The covers alone are worth the price of admission. You can see them evolve from very amateur efforts in the first 50 issues, into an 8" X 11" magazine on cardstock paper, with covers that presented many fans that later turned pro, such as Don Newton, Richard Corben, Bill Black, Robert Kline, John Adkins Richardson, Mike Zeck, Kerry Gammill, Butch Guice, Ron Wilbur, science fiction illustrator Stephen Fabian, and others. Along with very talented amateurs like Jerry Fantuccio.

Along with occaasional offerings by old pros like Gil Kane, Wallace Wood (who also did the fanzine WITZEND), Tom Sutton, and CC Beck.