Technologies for sustainable agriculture in the tropics : proceedings of two international symposia sponsored by Division A-6 of the American Society of Agronomy in San Antonio, TX, and Denver, CO, 1990 and 1991 respectively
· editors, John Ragland and Rattan Lal ; organizing committee, John Ragland (1990), Uzo Mokwunye (1991) ...
Bok Engelsk 1993