TY  - BOOK
AU  - Prescott G W
TI  - How to know the fresh water algae
T2  - Pictured-Key Nature Series; 15
U1  - I9557-22:5, J4   CS 
PY  - 1954///
CY  - Iowa
PB  - W M Brown     
KW  - Ecological group plants
ER  -