Start with a keyword search in the catalog. Once you have located a relevant item, you can look at the Library of Congress Subject Headings within the full record tab and follow those links to find related books.
You can also refine your search by using the features on the left side of the screen. To search for books by an author, use an Author Search. To search for books about an author, use a Subject Search.
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Important Library of Congress Classification Ranges for your research
PQ's (floor 7 in Davis Library) Romance Language Literatures