title: Nutrition Classics. The New England Journal of Medicine 239:911-3, 1948. Observations on the etiologic relationship of achylia gastrica to pernicious anemia. X. Activity of vitamin B12 as food (extrinsic) factor. By Lionel Berk, William B. Castle, Arnold D. Welch, Robert W. Heinle, Rudolf Anker, and Martin Epstein.
mesh_terms: D000126:Achlorhydria / Q000266:history*; D000752:Anemia, Pernicious / Q000266:history*; D005750:Gastric Juice; D006397:Hematinics; D049673:History, 20th Century; D006801:Humans; D014481:United States; D014805:Vitamin B 12 / Q000627:therapeutic use*
chemical_list: D006397:Hematinics; D014805:Vitamin B 12