Dust Bowl farmer drives a tractor with his son near Cland, N.M. (1938). Steinbeck writes: "The tractors came over the roads and into the fields, great crawlers moving like insects, having the incredible strength of insects ... monsters raising the dust and sticking their snouts into it, straight down the country ... through fences, through dooryards, in and out of gullies in straight lines." (Library of Congress)
