First, further information on the role that newspaper hoaxes played in early American sf or proto-sf.
Second, that there really was a community of San Francisco writers who published in numerous San Francisco publications and mostly set their stories, not surprisingly, in Frisco. The constant referrals to each others’ works shows a clear beginning of the genre awareness necessary to say that sf existed as an “invitation to form” then. There was also a generous helping of foreign sf and fantasy, including Jules Verne, published in these same magazines and newspapers. I found it interesting that many writers, foreign and American, referenced Edgar Allan Poe as the father of the new genre that was to become sf. He certainly inspired Verne if not Wells. Poe, as a writer (and I never noticed this point) created stories of the fantastic without the supernatural. Poe, under the “invitation to form” definition of sf, may have a pretty strong claim to founding sf.
The Frisco writers may have influenced Wells since their work was sometimes reprinted over seas. William C. Morrow may have been the inspiration for the idea and eponymous character of Wells’ The Island of Dr. Moreau. Moskowitz’s main emphasis is on the career of Robert Duncan Milne, a Scottish-American (a very well-educated remittance man and drunk) who, from 1881 to about 1899, has a very good claim to being the world’s first full time sf writer.