Photograph of a Caterpillar Sixty snow plow clearing snow in Sequoia National Park, 1931. A dirt strip cleared of snow winds around the edge of a snow-covered mound on the right with the plow widening the strip at center. A large mound of snow still stands on the left with snow-dusted boulders further down along the side of the strip. Tall, thin spruce trees stand shade the snow in the background. Photoprint reads: "Received from Doyle. In beautiful Sequoia National Park, California, this 'Caterpillar' Sixty equipped with back filler blade is engaged in clearing snow from the roadways".