An evaluation of the effects of acid rain on low conductivity headwater streams in Pennsylvania

MLA

Ritter, John R., Ann E. Brown and Geological Survey (U.S.). An evaluation of the effects of acid rain on low conductivity headwater streams in Pennsylvania. [Harrisburg, Pa.?] : U.S. Geological Survey, [1981]

APA

Ritter, J., Brown, A. & Geological Survey (U.S.). (1981). An evaluation of the effects of acid rain on low conductivity headwater streams in Pennsylvania. [Harrisburg, Pa.?] : U.S. Geological Survey.

Chicago

Ritter, John R., Ann E. Brown and Geological Survey (U.S.). An evaluation of the effects of acid rain on low conductivity headwater streams in Pennsylvania. [Harrisburg, Pa.?] : U.S. Geological Survey, [1981]