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Sommer. On the question of kindred marriages and reduction of the number of ancestors in humans and animals. Zur Theorie der Verwandtenehe und des Ahnenverlustes bei Menschen und Tieren. Klinik f. psych. u. nerv. Kankh. v. R. Sommer. BVH 4. S. 291
Nearly thirty years have elapsed since a list of Ohio fishes was issued.(The Fishes of Ohio, Osburn, Special Paper No. 4, Ohio Academy of Science, June 1901). In this report