...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?」
...This is apparently one of the most important protectivedevices to be found in Nature and the validity of it is nowgenerally conceded by naturalists...
Clarence M. Weed 「Butterflies Worth Knowing」
...The whole subject of the validity of warning colorationhas recently been brought up for reconsideration by the illuminatinginvestigations of Mr...
Clarence M. Weed 「Butterflies Worth Knowing」
...A careful review of these snakes is needed to verify the validity of the characters used to separate the subspecies and to determine areas of intergradation...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...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」
...The taxonomic validity of Pseudoficimia pulcherrima remains doubtful,for only minor characters distinguish it from P...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...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」
...Thistheory received almost universal acceptance, Jim Carpenter alone of themore prominent men of learning refusing to admit the validity of it...
Various 「Astounding Stories of Super-Science July 1930」
...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」
...The nature and validity ofthe conclusions to be drawn can be best appreciated by a statement ofsome features of this tendency of the stars to crowd towards thegalactic circle...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
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