Willcox, Oswin W. ABC of agrobiology, the quantitative science of plant life and plant nutrition for gardeners, farmers and general readers - New York : Norton, 1937 - 323 p. : ilus., gráfs. LCCN: 54715 Subjects--Topical Terms: Agrobiologia.Cultivos--Rendimiento. Dewey Class. No.: 630.274 / W5