Crop productivity. - BIOTOL (Project).; Open Universiteit (Heerlen, Netherlands).; University of Greenwich (Oxford Boston Butterworth-Heinemann, 1994)
"Published on behalf of Open universiteit and University of Greenwich (formerly Thames Polytechnic)."
Includes bibliographical references (p. 279-281) and index.
Keywords: Agricultural productivity -- Programmed instruction; Crop yields -- Programmed instruction