Some enterprising soul over at the Internet Archive has uploaded a scan of the very first science fiction magazine.
Amazing Stories Volume 01 Number 01 (April 1926). Scanned copy of a pulp magazine published by Experimenter Publishing Co. and edited by Hugo Gernsback. Periodical copyright not renewed. Individual contributions' copyrights not renewed. This magazine and its contents are now in the public domain. This is the first issue of the first science fiction magazine in history.