"Energikilder" . . "Mechanization" . . "Udstyr" . . "Implements" . . "U-lande" . . "Developing countries" . . "Manpower" . . "Agriculture" . . "Trækkraft dyr" . . "Menneskelig arbejdskraft" . . "Energy sources" . . "Redskaber" . . "Mecanizacao Agricola." . . "Mekanisering" . . . . . . "Human and animal power; Mechanical power; Agricultural production systems; Tillage; Planting; Fertilization; Weed control; Insect and predator control; Harvesting; Grain drying and storage; Transport; Social consequences; Machinery economics." . . . "History" . "History"@en . . . . . . . . . . . . . . . "Dibble sticks, donkeys, and diesels : machines in crop production" . . . . "Dibble sticks, donkeys, and diesels : machines in crop production"@en . . . . . . . . . . . "Dibble sticks, donkeys, and diesels machines in crop production" . "Equipment" . . . . "Machinery" . . "Landbrug" . . "Animal power" . . "Maskiner" . .