Vaughan, Lawrence Moore 1898- creator Hardin, Lowell Stewart 1917- joint author. text bibliography nyu New York J. Wiley [1949] 1949 monographic eng

print

xii, 145p. illus. 22cm. by Lawrence M. Vaughan [and] Lowell S. Hardin. "This publication is jointly sponsored by the work simplification committees of the American Farm Economic Association and the American Society of Agricultural Engineers." "Further reading" at the end of each chapter. S561 .V3 631.1 agr49000428 DLC 740220 20260227111011.0 agr49000428