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  1. Extension bulletin - Ontario Agricultural College, School of Agricultural Economics and Extension Education
  2. Bulletin - University of Puerto Rico, College of Agriculture and Mechanic Arts, Agricultural Experiment Station
  3. Research bulletin - Ontario Agricultural College, School of Agricultural Economics and Extension Education
  4. University of Kentucky, College of Agriculture, Cooperative Extension Service
  5. Leaflet - Cooperative Extension Service. University of Georgia College of Agriculture
  6. Circular - Cooperative Extension Service, University of Georgia College of Agriculture
  7. UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN COLLEGE OF AGRICULTURE AGRICULTURAL C
  8. Circular - University of Hawaii, College of Agriculture, Agricultural Experiment Station
  9. Annual report of the New York State College of Agriculture and Life Sciences at Cornell University & the Cornell University Agricultural Experiment Station
  10. Bulletin of the Agricultural Experiment Station of the University of Tennessee, state agricultural and mechanical college