I am glad to see someone covering e-books. There are more and more of them, some very good, such as Gold Standard and Twelve Sides by Kyell Gold.
During the 1990s, as furry fandom got computerized and before the birth of furry specialty publishers, there were numerous online bibliographies of “all” the books of anthro animal interest. Each online bibliography was slightly different, including some books that weren’t in other bibliographies. These bibliographies tended to last for a few years each, appearing and disappearing as the fans and their websites did. It was my annoyance that none of these bibliographies were complete, or permanent, that led me and Yarf! to publish three editions of An Anthropomorphic Bibliography from 1995 to 2000. The 3rd edition included over 500 anthro novels and anthologies.
Of course, none of these were e-books. According to Wikipedia, e-books were proposed in the 1930s, invented in 1949, refined during the last half of the 20th century, and did not become popular until the 2000s, with original e-fiction appearing during the last half of the 2000s and exploding during the 2010s.
Someone needs to compile a new complete bibliography of anthropomorphic fiction, since there have been so many furry specialty publishers such as FurPlanet Productions, Rabbit Valley Books, and Sofawolf Press, mostly active during just the last ten years. This bibliography should have two parts; one for books that have paper editions, and one for titles that exist as e-books only. Who will volunteer to compile such a bibliography? Or to head a team of volunteers? And which publisher is interested in publishing it?
http://second-ed-online.myshopify.com/products/anthropomorphic-bibliography-vol-3-an-2000-fred-patten