Eastern Washington State Historical Society/Northwest Museum of Arts & Culture (MAC) Collections: includes items on Regional History, Fine Art and American Indians and other cultures in the region.
City-County of Spokane Historic Preservation Office
American Indians of the Pacific Northwest Collection: From the University of Washington Libraries, access online versions of full-text primary documents, and original photographs relating to Native Americans of the Pacific Northwest.
Columbia River Basin Ethnic History Archive: a project of Washington State University Vancouver, the Idaho State Historical Society, Oregon Historical Society, Washington State Historical Society, and Washington State University Pullman.
Campbell House: "Learn about the Campbell household and the changes in business, community life, and technology that faced this family, its servants, and its community, circa 1910." A beautiful mansion and interesting history.
Inland Northwest Memories Project: Funded in part by a grant from the National Endowment for the Humanities.
Spokane Historical: "a web and mobile platform for telling stories of Spokane and Eastern Washington. Spokane Historical is a project of the Public History program at Eastern Washington University."
Northwest History: "Explorations in digital history in the Pacific Northwest--and beyond."
Inland Northwest Rail Museum: Devoted to preserving the railroad history of Eastern Washington and the Inland Northwest, from the Inland Empire Railway Historical Society, a non-profit corporation and regional chapter of the National Railway Historical Society.
Historic Tour of Spokane's Riverfront Park: a Google map