TY  - BOOK
AU  - Beck, Charles B
TI  - Origin and evolution of gymnosperms
SN  - 023106358X
SN  - 88014758
U1  - 561.5 BEC 
PY  - 1988///
CY  - New York
PB  - Columbia University Press
KW  - Gymnosperms - Evolution
KW  - Gymnosperms - Origin
KW  - Gymnosperms, Fossil
N1  - Includes bibliographical references and index
ER  -