H.P. Beukema Introduction to potato production - Wageningen Pudoc 1990 - 208p H.P. Beukema & D.E. Van Der Zaag: Introduction to potato production. Wageningen. Pudoc, 1990. 90-220-0963-7--(635.21BEU) ENGLISH ISBN: 90-220-0963-7 Dewey Class. No.: 635.21 / BEU