The Vassar Libraries, like most American universities and colleges, uses the Library of Congress Classification system to organize books on the shelves. For research in American History, you'll find that many relevant titles are in the E and F call number ranges. In the Main Library at Vassar, this call number range is on the Second Floor, Rooms 210 and 211. You may also want to browse sections of the HN (social history, social problems, social reform) and HQ (the family, marriage, women) ranges in room 49. When you find a book on the shelf, check the books around it while you're there.