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  1. Guide C - New Mexico State University, Cooperative Extension Service
  2. Extension publication - Cooperative Extension Service. University of New Hampshire
  3. University of Kentucky, College of Agriculture, Cooperative Extension Service
  4. Leaflet - Cooperative Extension Service. University of Georgia College of Agriculture
  5. Circular - Cooperative Extension Service, University of Georgia College of Agriculture
  6. Animal sciences P : poultry - Purdue University, Cooperative Extension Service
  7. Leaflet - Cooperative Extension Service
  8. Annual report - Florida Cooperative Extension Service
  9. Available publications of the Cooperative Extension Service and Agricultural Experiment Station
  10. Contributions from the Perkins Observatory, Ohio Wesleyan University and Ohio State University