If you're interested in a broad topic related to German Studies, or would like to browse for inspiration, try one of these Library of Congress call letters:
Locations of print books:
Cambridge Companions are a series of authoritative essay collections that synthesize the most important aspects of a topic. Each volume is edited by a leading scholar in the field and offers essays written by experts. Look for Companions on specific authors, genres, themes or movements, and time periods.
Use Google Books to search the text of a book.
Collins Library, like most academic libraries in the United States, uses Library of Congress Subject Headings to describe the content of books. Library of Congress Subject Headings can also help you find more scholarly work on an author, work, or literary theme.
Here are some examples of different types of subject headings that you could search: