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)