Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts1925Bulletin / Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
No. 229
Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts1923Bulletin / Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
No. 214
Agricultural Experiment Station, Iowa State College of Agriculture and the Mechanic Arts1921Bulletin / Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
No. 198
