This list of books for readers of all ages was compiled by the League of Women Voters of Ohio in commemoration of the 100th anniversary of the ratification of the 19th Amendment to the U.S. Constitution.
Click the link above to browse through the top levels of the Library of Congress Classification System as presented in Wikipedia.
History books are usually, but not always, in D, E and F. Find the subcategory you want to explore--for example, DQ--then look for call numbers starting with DQ in the library stacks (shelves).
Women's history is often, but not always, in H.
All of the above are shelved on the 3rd floor.
Another strategy: find another book on your topic in the library catalog (click for example), then look on the shelves nearby.