The Bechdel Test is a popular and very simple test to judge movies on their level of representation. For a movie to pass: (1) it has to have at least two women in it, who (2) who talk to each other, about (3) something besides a man.
If you ever want to check if a film passes the test, check here. For now, under the cut are the links to movies made before 1970 that do pass. (more masterposts)