作者
Colorado Agricultural College. Extension Service
55
Colorado A & M College. Extension Service
21
Colorado State College (Fort Collins, Colo.). Extension Service
15
Michigan Agricultural College
4
Farmers' Week (East Lansing, Mich.)
2
Farmers' Week and the Housewives' Congress
2
Michigan State College
2
Michigan State University
2
Michigan State College of Agriculture and Applied Science
1