TY  - BOOK
AU  -  Bir,S.S.
TI  -  Pteridophytes : :  their morphology, cytology taxonomy and phylogeny / 
U1  -  587 PTE 
PY  - 1983///
CY  -  New Delhi : 
PB  -  Today and Tomorrow's Printers & Publishers, 
KW  -  Pteridophyta
ER  -