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
Urban Aerosol Acids: Analysis of National Institute of Standards and Technology Standard Reference Material 1649. Sparacino, C. M; Frazier, S. E; Nishioka, M. G; Lewtas, J.	PB91242529	1990	16 pages
Bioassay-Directed Fractionation of the Organic Extract of SRM 1649 Urban Air Particulate Matter. Lewtas, J; Chuang, J; Nishioka, M; Petersen, B.	PB91242511	1990	12 pages