Association References Further reading External links Historic photos Andreas' History of Nebraska "Douglas County Historical Society" Early History of Omaha by former mayor Alfred Sorenson. "Early Omaha: Gateway to the West" by the Omaha Public Library. of the Nebraska State Historical Society. Historic Florence Florence Futures Foundation website. Mardos Memorial Library featuring Douglas County history. Old Nebraska News. "Project Omaha" at Omaha South High School from the Internet Archive. Sarpy County Historical Museum website. website. Brief History of Omaha, Nebraska WPA Omaha, Nebraska City Guide Project by the University of Nebraska Omaha Dr. C.C. and Mabel L. Criss Library North Omaha History website. Reconnaissance Survey of Downtown and Columbus Park Omaha - Nebraska State Historical Society, August 2011 Omaha