Books by Roy Jefferson Smith
Herbicide programs for weed control in rice
Weed control in U.S. rice popu
Weed control in U.S. rice population
Weed control in U.S. rice prod
Weed control in U.S. rice production
Weeds and their control in ric
Weeds and their control in rice production
Lemon picking and the Ventura County production incentive wage system