I just found that the sefer Kol Hator is available online in pdf form. It was written by one of the talmidei HaGra and is available online at Israel613.com. I just printed it out for myself (pages 86-241 of the pdf) This sefer was relied upon heavily in this book, which dealt with how the development of feminism fits into the progression toward the Geula.
Update: Avakesh, in this post, linked to an English translation of the 3rd and most apropos, perek of Kol Hator HERE.
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