Barkin David Food crops Vs feed crops Global substitution of g Barkin David - Boulder Lynne Reinner 1990 - xiii,168p cm. Bib p. 155-163,Appendix p. 145-149 ISBN: 1555871852 Source: General Book Subjects--Topical Terms: Food Industry Dewey Class. No.: X9(J3).1(X).N8, N0