“Showing Furrow Method of Irrigating Potatoes. The arrows indicate the direction taken by the capillary water."—The Federal Digest, 1921
The Federal Digest Farm Economy (Minneapolis, MN: Better Farming Association, 1921)
2400×413, 99.3 KiB
1024×176, 16.6 KiB
640×110, 9.5 KiB
320×55, 4.2 KiB