To find a biography or autobiography, use the LC Subject Heading dropdown menu and search "BIOGRAPHY" or "AUTOBIOGRAPHY". Use the keyword or topic search tools to narrow your results to your individual.
For example, to find a biography of Cesar Chavez, use the advanced search option. In the first field, type "BIOGRAPHY" and select LC Subj Heading from the drop down menu. In the next field, type Chavez, Cesar, and select Topic: Title + Subject in the drop down menu. You may also want to limit your results to just books by choosing "Books" from the drop down menu for Material Type.