Agriculture in the whirlpool of change : papers presented at the Centennial Symposium, Ontario Agricultural College, University of Guelph, October 17, 18, 1974. Ontario Agricultural College. Ontario Agricultural College. Agriculture Congresses. S401 .A47 630 AGR Includes bibliographical references. [Guelph], Ont. : Ontario Agricultural College, c1975. c1975. 1975 Text viii, 232 p. : eng