Dairy-herd improvement through cooperative bull associations
McDowell, J.C.
Dairy-herd improvement through cooperative bull associations - Washington 1927 - 1-14 p. - United States Department of Agriculture. Farmers' Bulletin No. 1532 .
Dairy-herd improvement through cooperative bull associations - Washington 1927 - 1-14 p. - United States Department of Agriculture. Farmers' Bulletin No. 1532 .