...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」
..."Resolved, That the migration or importation of slavesinto the United States, or any territory thereof, beprohibited after the first day of January, 1808...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...This barrier, then, seems to explain the absence of the horse among the Hottentots, though it is not opposed to the southern migration of cattle, sheep, and goats...
David Livingstone 「Missionary Travels and Researches in South Africa」
...“They will go directly on to the southward,” replied Swinton; “the migration of these animals is one of the most remarkable proofs of the fecundity of animal life...
Captain Frederick Marryat 「The Mission; or Scenes in Africa」
...It was first thought to encourage migration to Sierra Leone, andeighty-eight Negroes were sent, but they were not welcomed...
W.E.B. Du Bois 「The Negro」
...The hundredsof Negro tongues or dialects in the north represent most probablythe result of war and migration and the breaking up of ancientcenters of culture...
W.E.B. Du Bois 「The Negro」
...It was characterized bya large migration to the towns...
Booker T. Washington 「The Negro in the South」
...The loss occurred practicallyall along their east-and-west line of migration, from Arkansas tothe Atlantic Coast...
William T. Hornaday 「Our Vanishing Wild Life」
...This great southward highway has been chosen by the birds ofcentral Europe as their favorite migration route...
William T. Hornaday 「Our Vanishing Wild Life」
...In the Buenos-Ayrean district it probablyhas a partial migration, as small flocks are seen to arrive in spring; butfurther south, in Patagonia, it appears to be strictly resident...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...I have met with this bird at all seasons of the year in Patagonia on theRio Negro, and think it probable that it has no migration...
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」
...They have been observed in migration from the swamps of the barrier beach to the mainland in late October and early November in southeastern Virginia (Wood, 1954a:159)...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...A quantitative study of the nocturnal migration of birds...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...In the fall migration Kingbirds gather inloose flocks...
Frank M. Chapman 「What Bird is That?」
...It nestsfrom Texas up the Mississippi Valley and eastward throughcentral New York and Massachusetts to New Brunswick,north to Canada; and in migration is found in the rangeof the Purple Grackle...
Frank M. Chapman 「What Bird is That?」
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