TY  - BOOK
AU  - Sylvester-Bradley,P.C.
ED  - The Systematics Association, Xander
TI  - The species concept in palaeontology: a symposium 
U1  - 560 
PY  - 1956///
CY  - London
PB  - The Systematics Association
KW  - Paleontology
KW  - Species
N1  - Includes bibliographical references and index
ER  -