TY  - BOOK
AU  - JohnD. Wehr and Robert G.Sheath
TI  - FreshWater Algae Of North America
SN  - 0127415505
AV  - QK 569.A43 
PY  - 2003///
CY  - New York
PB  - Acadaemic Press
KW  - Fresh water Algae
ER  -