1. Relation of periphyton and benthic invertebrate communities to environmental factors and land use at selected sites in part of the upper Mississippi River basin, 1996-98 Author/Creator: ZumBerge, Jeremy R. (Jeremy Ryan), author Publication/Creation: [Mounds View, Minn.] : U.S. Deptartment of the Interior, U.S. Geological Survey, 2003 Resource Type: Book Access & Availability: Loading