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
Performance of Trickling Filter Plants: Reliability, Stability, Variability. Haugh, R; Niku, S; Schroeder, E. D; Tchobanoglous, G.	PB82108143	1981	111 pages
Handbook: Improving POTW (Publicly Owned Treatment Works) Performance Using the Composite Correction Program Approach.	PB88184007	1984	274 pages
Retrofitting POTWs. Hegg, B. A; Demers, L; Barber, J; Barth, E. F; Chapman, D. T.	PB90182478	1989	307 pages