TY  - RPRT
TI  - Assessment of stream quality using biological indices at selected sites in the Big Elk and Octoraro Creek basins, Chester County, Pennsylvania, 1981-97
AU  - Andrew G. Reif
PY  - 2002
DO  - 10.3133/fs11502
UR  - https://pubs.usgs.gov/publication/fs11502
ID  - fs11502
ER  -