The typical representation of cultivated fields in general on a topographical map.
Lieutenant Colonel William E. Persons, Infantry Major Oliver S. Wood, Infantry Major Joseph Plassmeyer, Cavalry Captain Paul V. Kellogg and , Infantry First Lieutenant John E.McCammon Military Science and Tactics (, MO: The University Co-operative Store, 1922)
2400×1712, 605.3 KiB
1024×730, 98.8 KiB
640×456, 55.3 KiB
320×228, 23.6 KiB