...That the migration or importationof such persons as any of theStates now existing shall think properto admit, cannot be prohibited byCongress, prior to the year one thousandeight hundred and eight... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
..."The migration or importation of slaves into theUnited States or any of the Territories thereof,from any foreign country, is hereby prohibited...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...They found partially disrupted Negro states on the west coastand falling empires in the Sudan, together with the old unrest ofover-population and migration in the valley of the Congo...
W.E.B. Du Bois 「The Negro」
...North of the Zambesi, in British territory, the chief role in recenttimes has been played by the Bechuana, the first of the Bantu toreturn northward after the South African migration...
W.E.B. Du Bois 「The Negro」
...The Doukhobors: Their History in Russia; Their Migration to Canada...
Various 「Mother Earth, Vol. 1 No. 4, June 1906」
...“The line of march of this great spring migration was not always thesame, though it was confined within certain limits...
William T. Hornaday 「The Extermination of the American Bison」
...ThisThrush has, I believe, a partial migration in Buenos Ayres...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Further south their migration is more strict; and on the Rio Negro,in Patagonia, from March to August I did not meet with a singleindividual...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...It has, I fancy, a limited migration, as I could neverfind one in winter...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...In Buenos Ayres, where they are most numerous, they havea migration, which is only partial, however...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...The migration of birds is only one case of a phenomenonwhich is comparatively common...
Worrallo Whitney 「A Guide for the Study of Animals」
...From your text andreference books find other examples of migration...
Worrallo Whitney 「A Guide for the Study of Animals」
...A small stream west of the swamp seems to be used as a migration route to and from the swamp...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...In addition to the above he cites differences between thecarduelines and the "other" fringillids in the appendicular skeletons,in geographic distribution, in patterns of migration, and in habits...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...A quantitative study of the nocturnal migration of birds...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...However, in ourwinterless clime, migration is not complete, and this year (1910)there was probably little migration of Swallows...
John Albert Leach 「An Australian Bird Book」
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