References by Author or Types

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Journal Articles by G. G. Simpson

G. G. Simpson and Others
The principles of classification and a classification of mammals
Bull. Am. Mus. Nat. Hist., 85, 1945
https://www.cabdirect.org/cabdirect/abstract/19502901535

G. G. Simpson
Principles of animal taxonomy
Columbia University Press, 1961
https://archive.org/details/principlesofanim0000simp/mode/2up