Includes some magazines.

WorldCat is the world’s most comprehensive database of library materials. Updated at a rate of nearly one new record every second, WorldCat contains bibliographic records and holdings contributed by more than 11,000 libraries around the world.

Library of Congress Subject Headings (LCSH) has been actively maintained since 1898 to catalog materials held at the Library of Congress. By virtue of cooperative cataloging other libraries around the United States also use LCSH to provide subject access to their collections. In addition LCSH is used internationally, often in translation.