Young, A. Agroforestry, environment and sustainability / A. Young. - Nairobi : International Council for Research in Agroforestry, 1990. - p. : ill., photos ; 30 cm. - ICRAF reprint ; no. 73 . Reprinted from Outlook on agriculture, 19: 155-60, 1990. Includes bibliographical references. Subjects--Topical Terms: Agroforestry. Land use.