...Subspecific assignments have been made only when there is evidence ofintergradation...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
..." Not always have Iagreed with Mayr's assignments of species to these categories, andsuch differences are noted...
Richard F. Johnston 「The Breeding Birds of Kansas」
...The followingclassifications and assignments may, therefore, in some instances, bequestioned...
John C. Van Dyke 「A Text-Book of the History of Painting」
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