Tractors Advance during the Depression Farming in the 1930s Tractors in the 1930s "Tractors Advance during the Depression" Tractors Tractors Advance during the Depression "Tractors in the 1930s" "Tractors Advance during the Depression" Tractors in the 1930's “Tractors Advance during the Depression” Tractors Advance during the Depression "Tractors in the 1930s" Tractors Tractors in the 1930s. Тракторите през 1930 г.