The Reverend George Henry Atkinson Collection holds printed materials by and about the Reverend George Henry Atkinson, a pioneer who lived in Oregon from 1848 to 1889.

The Lee Moorhouse Photographs collection contains approximately 1,500 glass plate negatives stored at the Umatilla County Historical Society. All plates have been digitized, and approximately one thousand of them were selected to be uploaded to the Whitman College and Northwest Archives online archival database. The photos were taken by Major Lee Moorhouse between 1897 and 1915. Moorhouse is most well-known for being the Indian agent on the Umatilla Indian Reservation from 1889 to 1891.

The St. Paul Mission Historical Society Photographs, which date from 1911 through 1929, contain photographs compiled by the historical society depicing agricultural activities, fair and farm shows, parades, trains, landscapes, mountains, buildings, and city scenes.