TY  - GEN
AU  - Patrick,
TI  - A proposed biological measure of stream conditions, based on a survey of the Conestoga basin, Lancaster Country Pennsylvania
T2  - Proceedings of the academy of natural sciences of Philadelphia
PY  - 0000///[s.n.]
CY  - [S.l.]
PB  - 1949
KW  - 0141 p
ER  -