TY  - BOOK
AU  - Bir, S. S.
TI  - Pteridophytes: their morphology, cytology, taxonomy and phylogeny 
AV  - QK521 .P8 1983
PY  - 1983///
CY  - New Delhi
PB  - Today and Tomorrow's Printers and Publishers
KW  - Pteridophytes
KW  - Botany
N1  - Includes bibliographical references and index
ER  -