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(1) «Information respecting the history, condition and prospects of the indian tribes of the United States... by Henry R. Schoolcraft — Philadelphia Lippincott Grambo & C. 1854» Vedi le tav. 31, 32 33, 34 e 35.
(2) «Prehistoric Europe a Geological Sketch by Iames Geikie — London, Stanford, 1881.»
(3) «Pre-Historic Times as illustrated by Ancient Remains and the manners and customs of Modern Savages, by sir Iohn Lubbock — Villiams and Norgate 1869.»
(4) «International Congress of Prehistoric Archaeology: Transactions of the third Session (1868) — London; Longmans, Green and Co. 1869 — V. a p. 206 e 256.
(5) «Hommes fossiles et hommes sauvages. Études d'anthropologie par A. de Quatrefages — Paris Baillière 1884 — pag. 342, 454.
(6) «La Vega, Viaggio di scoperta del passaggio Nord-Est tra l'Asia e l'Europa narrato dal