South Dakota, nicknamed the Mount Rushmore State, became the 40th state on November 2, 1889. The state capital, Pierre, is considered one of the smallest state capitals in the United States. This guide compiles links to digital materials related to South Dakota such as books, government documents, manuscripts, maps, motion pictures, photographs, sheet music, and sound recordings that are available throughout the Library of Congress website. In addition, it provides links to external websites focusing on South Dakota and a bibliography containing selected works for both general and younger readers.