636.2 Yap D Yapp, William Wodin Dairy Cattle, selection, feeding, and management [by] William Wodin Yapp [and] William Barbour Nevens. 4th. ed. New Yoek, J. Wiley [c1955] xii, ilus., diagrs., tablas. 22 cm. Bibliografía al final de los capítulos.