TY  - BOOK
AU  - Perscott G W
TI  - How to know the freshwater algae
U1  - I22:5.1951, J4;L8 
PY  - 1978///
CY  - Dubuque
PB  - Wm C Brown       
KW  -  Algae
KW  - Botany
N1  - Appendix 260-280p
ER  -