...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」
...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」
...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」
...Even the validity of the genus is open to question;this problem is discussed at length in the section beyond entitled"Ptychohyla as a Natural Assemblage...
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」
...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」
...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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