Books, including those in Reference, are shelved in general subject categories using the Library of Congress classification system. You may want to supplement your use of the catalog with browsing shelf areas for your topic. Below is a brief listing of some of the subject locations in the field of Geology.
Use the drop down menu from the reference works tab above to find reference sources works related to Geology.
The guide is not comprehensive, so stop by the reference desk to chat with a librarian about finding additional information.