The original dirt mover. I immediately visualize old photos of Holt and Deere tractors (with fading yellows and greens) fitted with dozer blade attachments, no cab protection, and big piles of earth.

Part one. Bulldozers at war. "A dirt moving war" : engineers and Seabees as World War II heroes -- Prime movers : equipment manufacturers prepare for postwar prosperity -- Part two. Bulldozers at work ...