Supplies. Corps of Engineers supply catalog, 1942: pt. 3, sec. M-10, Organizational spare parts sets for ditching machine, ladder type, crawler mounted, gasoline, digging depth 8′ 3″, width 24″, Barber-Greene, model 44C, applicable to machines with serial numbers 44-4-56 to 44-4-70 and 44-1-61 to 44-10-66.