"A Vindication of the Rights of Women" by Mary Wollstonecraft is already listed under "modern philosophy", as is "The Subjection of Women" by Mill, and Thomson's "A Defense of Abortion" is under "bioethics".
I would think that such works as "A Cyborg Manifesto" by Donna Haraway, "Anarchism" by Emma Goldman, or "Gyn/Ecology" by Mary Daly are at least as worthy of being listed here as "The Book of Five Rings" or Russell's "The Problems of Philosophy".