Have any farmers as ancestors? Did they use machinery for the harvest? Do you have pictures of them using the farm machinery? The Washington State Digital Archives has the A.M. Kendrick Collection of photos. Mr. Kendrick was a photographer in the Ritzville Washington area and took a lot of photos of farm machinery actually working on the farm. I clicked on "tractor" and 54 thumbnails came up, combine got 143 pictures, you can click on the thumbnails to make them larger.
This is an early cat tractor
Wolsborn Tractor drawn combine
Crist Schultz's Horse/Mule drawn combine at Harrington Washington