Best Classic Sci-fi Not Written by a Cis Het White Dude (Seconds and more nominations needed)

What is the very best science fiction book or series written by a woman or POC or member of the LGBTQ+ community that is from 1997 or earlier? 
Please check this post if you have any questions about the limiting factors of this poll.

All the rules are here. This is also where to leave nominations and seconds. 

I'm recovering from my last big article, which took upwards of 80 hours to write all told, so I took yesterday off from blogging (though not writing). I told my Patrons what was going on, but it'll cost folks at least a dollar a month to get those kind of updates. Lots of my third job this week, so even tomorrow might be a lighter fare, but we should be back on schedule.

In the meantime we need your seconds on the current batch of nominations for our next poll (and more nominations if you have them). I'd like to get this poll up by early next week.

Please go back to the original entry for both the rules and to drop a comment or second. If you place them here, they will not get counted (and probably not given the needed second).