...Enquiry into the Validity of the BritishClaim to a Right of Visitation and Search of American Vesselssuspected to be engaged in the African Slave-Trade... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...On one point only are they in harmony: namely, that the validity of the right of property depends upon the authenticity of its origin...
P. J. Proudhon 「What is Property?」
...Handley (1966b:762) and Starrett and Casebeer(1968:12) expressed doubt as to the validity of the currently usedsubspecific names in this species...
J. Knox Jones 「Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country」
...Sympatricoccurrence serves as an indicator of specific distinctness and is one ofthe more practical tests of species validity when cross-breedingexperiments are not possible...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...Because of these results, Williamsquestioned the validity of the assumption that P...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...Stuart, who will discuss the variation in, and the validity of, thenamed populations of valliceps...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...Okada (1934:17) questioned the validity of H...
Robert G Webb 「Some Reptiles and Amphibians from Korea」
...First, it is necessaryto determine the validity of the genus itself...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...The fact that estimates of the total population and the percentage-compositionagree in most respects lends support to the validity of both methods ofanalysis...
James Everett Deacon 「Fish Populations, Following a Drought, in the Neosho and Marais des Cygnes Rivers of Kansas」
...When one comes to French art it is stillmore difficult for us to realize that the ideas underlying itsexpression are ideas of import, validity, and attachment...
W. C. Brownell 「French Art」
...So long as the manner in which the planets came into beingcontinues an open question, conclusions about their timeof birth must remain of doubtful validity...
George C. Comstock 「A Text-Book of Astronomy」
...But in the proof of this greattheorem two influences were neglected, either of which isfatal to its validity...
George C. Comstock 「A Text-Book of Astronomy」
...Hequestions the validity of his argument that bodies of greater size andbrightness should not serve the smaller, though not bright, and thatheaven should move, while the Earth remained at rest...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...He hadnot mentioned the affair of 1616 because he thought that order did notapply to this book in which he proved the lack of validity and ofconclusiveness of the Copernican arguments...
Dorothy Stimson 「The gradual acceptance of the Copernican theory of the universe」
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