Whether finding out for yourself more about the history of feminism, or selecting books for a reading groups, these are good starting books: classics on feminism from before 1950.
1. Selected Writings of Judith Sargent Murray
Includes "On the Equality of the Sexes."
2. A Vindication of the Rights of Woman
by Mary Wollstonecraft (1892). I can't say I'm happy that the publisher changed Wollstonecraft's title to Women instead of Woman! I'm using her original title here.3. The Subjection of Women
by John Stuart Mill.4. Woman in the Nineteenth Century: An Authoritative Text, Backgrounds, Criticism
by Margaret Fuller.5. Elizabeth Cady Stanton, Susan B. Anthony, Correspondence, Writings, Speeches
Susan B. Anthony, Elizabeth Cady Stanton.6. The Second Sex
by Simone De Beauvoir, H.M. Parshley (Translator).