Moore, maybe, but Tiptree's one novel was not really up to snuff. (But ... h'mmm ... was Moore's best work even in the timeframe? On the other hand, neither was The Foundation Trilogy, so go figure.)

If I were going to observe the missingness of women, how about Connie Willis? Octavia Butler? Joanna Russ? Curely these belong there at least as much as, uh, #48.