LTRMP Procedures: Macroinvertebrate monitoring Thiel, P. A., and J. S. Sauer. 1999. Long Term Resource Monitoring Program Procedures: Macroinvertebrate monitoring. U.S. Geological Survey, Upper Midwest Environmental Sciences Center, La Crosse, Wisconsin, Revised May 1999. LTRMP 95-P002-2. (Revised 1999) 7 pp. + Appendixes A-H NO ABSTRACT or KEYWORDS