The Dictionary of Homophobia by 
Encyclopedia of Gay Histories and Cultures by 
Lesbian Histories and Cultures by 
LGBT Youth in America's Schools by In the most basic sense, subject headings are used to help the researcher more easily find materials on the same subject matter. Library of Congress Subject Headings are assigned to all, or almost all, books published after 1989 (think of this as library "tagging" but using the same terms so that everyone knows which terminology to use). For example, if I wanted to see what books my library might have on the Stonewall Uprising in New York, I might search for the following subject heading:
That subject heading would show me a list of items in Sterne Library written specifically about the Stonewall uprising. These include books and interviews in our collections.
