References
Dunn, T.B. and L.B. Leopold. 1978. Water in environmental planning. W.H. Freeman, San Francisco, CA.

EPA. 1997. Revision to rapid bioassessment protocols for use in streams and rivers: periphyton, benthic macroinvertebrates and fish. EPA/841-D-97-002. U.S. EPA, Washington, D.C.

Frest, T.J. 1987. Mussel survey of selected interior Iowa streams. University of Northern Iowa. Final Report to Iowa Department of Natural Resources and U.S. Fish & Wildlife Service. 354 pp.

Plafkin, J.L. M.T. Barbour, K.D. Porter, S.K. Gross and R.M. Hughes. 1989. Rapid bioassessment protocols for use in streams and rivers: benthic macroinvertebrates and fish. EPA/444/4-89-001. U.S. EPA, Assess. and Watershed Protection Div., Washington, D.C.