TY - RPRT TI - Effects of an aerial application of DDT on fish and fish-food organisms in two Pennsylvania watersheds AU - C. H. Hoffmann AU - E. W. Surber PY - 1949 DO - 10.1577/1548-8640(1949)11[203:eoaaao]2.0.co;2 UR - https://pubs.usgs.gov/publication/1014328 ID - 1014328 ER -