TY  - BOOK
AU  - Downing,Elliot Rowland
ED  - Asutosh Collection (National Library, India)
TI  - A source book of biological nature-study
U1  - 574.907 
PY  - 1919///]
CY  - Chicago
PB  - The University of Chicago Press
KW  - Natural history
KW  - Study and teaching
KW  - Nature study
N1  - Includes index
ER  -