PUBLICATIONS--"Methods for Collection and Analysis of Aquatic Biological and Microbiological Samples," WGS-Mail Stop 412 October 29, 1990 OFFICE OF WATER QUALITY TECHNICAL MEMORANDUM 91.01 Subject: PUBLICATIONS--"Methods for Collection and Analysis of Aquatic Biological and Microbiological Samples," L.J. Britton and P.E. Greeson, editors, Techniques of Water-Resources Investigations (TWRI) Book 5, Chapter A4 The attached report was prepared by the U.S. Geological Survey to provide accurate and precise methods for the collection and analysis of aquatic biological and micro- biological samples. The subject report supersedes TWRI Book 5, Chapter A4, published in 1977, entitled "Methods for Collection and Analysis of Aquatic Biological and Microbiological Samples" edited by P.E. Greeson and others. It also supersedes "A Supplement to--Methods for Collection and Analysis of Aquatic Biological and Microbiological Samples" by P.E. Greeson (TWRI Book 5, Chapter A4), Open-File Report 79.1279, 1979. Additional copies are available from the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center, Box 25425, Denver, Colorado 80225. Also available from the Books and Open-File Reports Section is Book 3, Chapter A18, "Determination of Stream Reaeration Coefficients by Use of Tracers," which was released in 1989 and supplements material in Book 5, Chapter A4. David A. Rickert Chief, Office of Water Quality Attachment This memorandum supersedes Office of Water Quality Technical Memorandum No. 80.02. Key Words: analysis, biology, methods, samples Distribution: A, B, S (one copy to each) FO, PO (standard distribution)