...Various reasons for this mild behavior are assigned by the officers, but none of these, when viewed in connection with our own experience in Australia, appear to be valid... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...The fourth, Cervus merriami, was undoubtedlya valid species...
William T. Hornaday 「Our Vanishing Wild Life」
...tumida, as defined by Goodwin(1958); we are not wholly convinced that these are valid species(rather than variable geographic races of the same species)...
J. Knox Jones 「Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country」
...Nevertheless, datafrom analysis of pellets when supplemented by field observations, shouldserve as a sound basis for valid conclusions concerning the relativeproportions of various foods eaten...
Dwight Platt 「Food of the Crow, Corvus brachyrhynchos Brehm, in South-central Kansas」
...The early sight records seem valid, however, and the species shouldremain on the state list...
Harrison B Tordoff 「Check-list of the Birds of Kansas」
...leucopus siredlitters when their testes appeared to be abdominal, and therefore questionedwhether the criterion of descended testes is valid as an indicator of breedingcondition...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...Günther (1901:268), Noble (1918:340), and Nieden (1923:251) regarded bothelaeochroaandquinquevittataas valid species...
Juan R. León 「The Systematics of the Frogs of the Hyla Rubra Group in Middle America」
...Hence the ancients held that what could not happen in theoriginal would have no valid reason for existence in the copy...
Vitruvius 「Ten Books on Architecture」
...Butthere are valid reasons for attaching the Hebrew popular myth to Orion...
E. Walter Maunder 「The Astronomy of the Bible」
...His reasons were perfectly valid, andsuch as any one may understand...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...This conclusion,however, is not generally valid...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
...And this statement is as valid today as itwas three hundred years ago...
Dr. D.M. Brooks 「The Necessity of Atheism」
...Subsequent reasoners have made use of their proofs, and even given them as extremely valid...
Paul Henri Thiery (Baron D'Holbach) Samuel Wilkinson 「The System of Nature, Volume 2」
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