TY - RPRT TI - Algal and Invertebrate Community Composition along Agricultural Gradients: A Comparative Study from Two Regions of the Eastern United States AU - Daniel L. Calhoun AU - M. Brian Gregory AU - Holly S. Weyers PY - 2008 DO - 10.3133/sir20085046 UR - https://pubs.usgs.gov/publication/sir20085046 ID - sir20085046 ER -