The Morda C. Slauson Collection on William Polk Gray, which dates from 1891 to 1968, collection contains correspondence, writings, and photographs of early Washington resident and steamboat Captain William Polk Gray.

The Walla Walla Union-Bulletin photographs houses the negatives and prints taken by newspaper photographers documenting people, places, and events of the Walla Walla Valley from 1949 to circa 2010. The Walla Walla Union-Bulletin is a daily newspaper providing coverage of Walla Walla Valley since 1938.