1. Economic history of the production of beef cattle in Iowa Creator: Hopkins, John A. 1897- Collection: Core Historical Literature of Agriculture Publisher: The State Historical Society of Iowa, Publication Place: Iowa City : Date: 1928 Format: Book
2. Elements of farm management Creator: Hopkins, John A. 1897- Collection: Core Historical Literature of Agriculture Publisher: Prentice-Hall, Publication Place: New York : Date: 1947 Format: Book