Library of Congress, Serials DivisionThe largest collection of comics books in the United States is housed in the Serial and Government Publications Division. The collection includes U.S. and foreign comic books—over 5,000 titles in all, totaling more than 100,000 issues. Primarily composed of the original print books, the collection includes color microfiche of a handful of the early comic books (such as Wonder Woman, Superman, and Action Comics) and special reprints. Although the collection is most comprehensive from 1950, scattered issues from numerous titles date back to the 1930s. A small number of comic books make up the Underground Comic Book collection of titles “recommended for mature readers.”