| 000 | 005260000a22001570004500 | ||
|---|---|---|---|
| 001 | 19997 | ||
| 090 | _a19997 | ||
| 100 | _a20190520 frey50 | ||
| 101 | _aeng | ||
| 200 | 0 | 1 |
_aA proposed biological measure of stream conditions, based on a survey of the Conestoga basin, Lancaster Country Pennsylvania _fRuth Patrick |
| 210 |
_a[S.l.] _c1949 _d[s.n.] |
||
| 215 |
_ap. 277-341 _cil. _d28 cm |
||
| 225 | _aProceedings of the academy of natural sciences of Philadelphia | ||
| 317 | _aIPIMAR | ||
| 676 | _a0141 p | ||
| 700 |
_aPatrick, _bRuth |
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