The collection consists of photographs of the Winninger family and the YU Ranch on the Greybull River during the years 1920 to 1940. The Winninger family was made up of Joseph Winninger, Mabel Buell Winninger and their four kids. John Joseph "Jack" Winninger was the oldest, born in 1926, and the donor of the collection with his wife JoAnn Winninger. The YU Ranch was primarily a sheep ranch, and in the late 30s also became a cattle ranch.