Principles and practice of butter-making, etc.
Mackay, George Lewis,Professor of Dairying in the Iowa State College.
Larsen, Christian,Dean of the Division of Agriculture, South Dakota State College.
New York & London, 
1922.
Joint authors: George Lewis Mackay, Professor of Dairying in the Iowa State College and Christian Larsen, Dean of the Division of Agriculture, South Dakota State College.