/2- 



ON THE MONO- OR POLYPHYLETIC ORIGIN OF TETRAPODS 



by E. I. Vorob'eva 



Zoologicheskii Zhurnal 

 (Zoological Journal) 



volume 45, number 9 

 pp. 1355-1368 



1966 



Translated from Russian by Frederick W. Ryan 



Edited by 



Bruce B. Collette 



and 



James A. Peters 



SMITHSONIAN HERPETOLOGICAL INFORMATION SERVICES 

 1968 



Additional copies available from: 



Division of Reptiles and Amphibians 

 United States National Museum 

 Washington, D. C. 20560 



