Use the Library catalog to find books about individuals:
By Author: Grant, Ulysses S. Personal Memoirs
By Subject: Thatcher, Margaret Margaret Thatcher: the Authorized Biography
Find more book-length biographies by searching the Library catalog for the word "biography" as a subject. Add additional terms to limit your search, for example: biography AND politicians.
Numerous encyclopedias, dictionaries, and other resources are listed in GEORGE which include biographies. For example:
Modify these searches to limit results by topic or by ebook.