There's a lot on her on the web. I searched by "Julia Cooper," and found one of the most detailed answers right here on answers.com.
http://www.answers.com/topic/anna-julia-haywood-cooper One of the first women to get a PhD, one of the first 4 black women to get a PhD, born to a slave, worked for equal rights for blacks and women. Seems to have been extremely influential, but of course most of us never heard of her. Thanks to the gov for putting her on a stamp now, maybe more of us will find out.