TY  - BOOK
AU  - Bir, S. S.  
TI  - Pteridophytic flora of Garhwal Himalaya : Mussoorie, Dehradub, Chakrata and adjoining hills 
U1  - 587.0954 
PY  - 1983///
CY  - Dehradun  
PB  - Jugal Kishor  
ER  -