You can search the Library Catalog for books about architecture by Keyword, Title, Author, and Subject. If you know the exact title of a book, you can use the title search or enter do a keyword search for the title in quotes (ex. "The Story of Modern Architecture").
You can also search by subject heading. This is not an exhaustive list of architecture subject headings. As you find items relevant to your research, take note of the subject headings listed. Using those will help you find similar relevant materials. Some useful subjects include: