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• Report on the birds of Pennsylvania. With special reference to the food-habits, based on over three thousand stomach examinations.
  Auteur(s): Warren, Benjamin Harry
• Diseases of poultry part 1
  Auteur(s): Pearson, Leonard ,  Warren, Benjamin Harry
• Essentials of milk hygiene : a practical treatise on dairy and milk inspection and on the hygienic production and handling of milk, for students of dairying and sanitarians
  Auteur(s): Pearson, Leonard ,  Jensen, C. O.