History of agricultural experimentation and research in the United States
Parker, William N, ed. series True, Alfred Charles
History of agricultural experimentation and research in the United States - New York Johnson reprint corporation 1937 - vi,321; ill - History of American economy : studies and materials for study .
Agricultural experiments
Agricultural research - United States
Agricultural research - United States - history
Experimentation stations
History of agricultural experimentation and research in the United States - New York Johnson reprint corporation 1937 - vi,321; ill - History of American economy : studies and materials for study .
Agricultural experiments
Agricultural research - United States
Agricultural research - United States - history
Experimentation stations