GUIDELINES FOR THE PROCESSING AND QUALITY ASSURANCE OF BENTHIC INVERTEBRATE SAMPLES COLLECTED AS PART OF THE NATIONAL WATER-QUALITY ASSESSMENT PROGRAM

U.S. Geological Survey

Open-File Report 93-407

We no longer process invertebrate samples using this protocol.

Please use Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-- Processing, taxonomy, and quality control of benthic macroinvertebrate samples (U.S. Geological Survey Open-File Report 00-212)