National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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Title/Authors	Accession Number	Publication Year	Page Count	Download
Evaluation of Benthic Macroinvertebrate Biomass Methodology. Part 2. Field Assessment and Data Evaluation. Mason, W. J; Lewis, P. A; Weber, C. I.	PB87146171	1985	28 pages
Evaluation of Benthic Macroinvertebrate Biomass Methodology. Part 1. Laboratory Analytical Methods. Mason, W. T; Lewis, P. A; Weber, C. I.	PB87146163	1983	20 pages