South Dakota State University has some online collections for family history and genealogy including:

• Government Documents at SDSU “South Dakota State University was designated as an official U.S. depository library in 1889. These materials cover a wide range of topics including agriculture, business, commerce, education, health, social issues, current events, congressional issues, and statistics. In addition to the Federal Documents published by the GPO, the collection includes a large collection of maps and microforms as well as State of South Dakota Documents.”
• Rare Books and Manuscripts “The South Dakota State University Archives and Special Collections in the Hilton M. Briggs Library houses rare books and manuscript collections including manuscript and archival materials, books, serials, audiovisual materials, and photographs. The collection consists mostly of materials related to South Dakota; in particular it documents organizations, local businesses, political and community figures, families, authors, and agriculture and rural life.”
• SDSU Archives “The South Dakota State University Archives Collection contains documents, images and other materials relating to the University, including administration, departments and colleges, committees, faculty and staff, and student organizations. SDSU was founded in 1881 as the Dakota Agricultural College.”
• Regional – SDSU “This collection consists of publications, documents, images and other materials relating to the history of the Brookings area and South Dakota. These materials also include the George and Evelyn Norby Collection, which relates to the City of Brookings.”
• Norby Photos Collection “The George and Evelyn Norby, Brookings and Brookings County, South Dakota Photograph Collection is composed of photographic images of Brookings, South Dakota from 1886-1998 and includes downtown businesses, homes, events, schools, people, South Dakota State University campus, and Hobo Day. There are also images of nearby towns in the Brookings County, South Dakota: Sinai, Elkton, White, Arlington, and Bruce.”
• Jack Rabbit Yearbooks ” The South Dakota State University’s yearbook, the Jack Rabbit was issued by the Junior Class from 1907-1934. Because of this, each yearbook for that time period documents the previous year. For example, the 1910 Jack Rabbit chronicles the events for the 1908-1909 academic year. Since 1935, the yearbooks have been produced by the Student Association and document the issued year’s activities.”

These databases are searchable at the Digital Library of South Dakota.