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31. Smallpox in Europe before the seventeenth century: virulent killer or benign disease? Carmichael AG, Silverstein AM. J Hist Med Allied Sci; 1987 Apr 01; 42(2):147-68. PubMed ID: 3295026 [No Abstract] [Full Text] [Related]
32. The demise of the Hopewellian moundbuilders: a plausible conjecture. Johnson HA. IMJ Ill Med J; 1975 Nov 01; 148(5):528-30. PubMed ID: 306 [No Abstract] [Full Text] [Related]