The William H. Gray Collection, which dates from 1836 to 1972, consists of correspondence, writings, clippings, and books of William H. Gray, a Northwest pioneer, who served on the Oregon territorial legislature.

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.