TY - RPRT TI - Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania; methods of data collection and analysis and description of study areas AU - Douglas C. Chichester PY - 1988 DO - 10.3133/ofr8896 UR - https://pubs.usgs.gov/publication/ofr8896 ID - ofr8896 ER -