Image of tractors in a field for a tractor demonstration. The demo took place on Yenney Farm Near Russell Creek in Walla Walla, Washington on April 23 through 25, 1919. The nearest tractor has written on a sign above it "Holt Caterpillar "45"." Written on front of image "Walla Walla Wn. Tractor Demonstration Apr. 23-4-5 1919 Photo By R. Burns Dayton Wn. #25."