I'm a librarian, so stand back:
The Mists of Avalon by Marion Zimmer Bradley
Sexism and God-Talk by Rosemary Radford Ruether
Woman: An Intimate Geography by Natalie Angier
When God Was a Woman by Merlin Stone
A Midwife's Tale by Laurel Thatcher Ulrich
Our Bodies, Ourselves by the Boston Women's Health Book Collective
Against Our Will by Susan Brownmiller
Backlash by Susan Faludi
A Vindication on the Rights of Women by Mary Wollstonecraft
The Second Sex by Simone de Beauvoir
Mismeasure of Woman by Carol Tavris
Women Who Run With the Wolves by Clarissa Pinkola Estes
Ain't I a Woman by bell hooks
A Handmaid's Tale by Margaret Atwood
The Mommy Myth by Susan Douglas and Meredith Michaels
Cunt: A Declaration of IndependenceReviving Ophelia by Mary Pipher
A Room of One's Own by Virginia Woolf
Of Woman Born by Adrienne Rich
Witches, Midwives and Nurses by Barbara Ehrenreich
For Her Own Good by Barbara Ehrenreich
I Never Called It Rape by Robin Warshaw
Colonize This! by Daisy Hernandez and Bushra Rehman
Manifesta by Jennifer Baumgardner and Amy Richards
The Woman's Bible by Elizabeth Cady Stanton
The Story of Jane by Laura Kaplan
When Abortion Was a Crime by Leslie Reagan.
You can see that the list reflects some of my specific interests: religion, healthcare, violence against women, women of color, historical feminism. If you're looking for something on a different topic or more specific, let me know and I'll do some searches for you.