1864?-1943 africanamericanagriculturists africanamericanfarmers africanamericanscientists agriculturalecology agriculturallandlanduseplanning agriculturalpollution agriculture agriculturists agrobiodiversity biblicalteaching biography burkinafaso carboncycle(biogeochemistry) carver congresses conservationists conservationofnaturalresources criticism cropyields economicaspects economicconditions environmentalaspects environmentalconditions environmentalprotection etc europe farms foodconservation foodsupply georgewashington governmentpolicy history interpretation landuse management masseyfamily pharsaliaplantation plantconservation politicalandsocialviewscarver protectedareas research rural slavery socialaspects soilconservation soilconservationprojects southernstates sustainableagriculture unitedstates urbanization vegetationmanagement virginia waterconservationprojects yatenga(region)