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
Hydrologic Evaluation of Landfill Performance (HELP) Model. User's Guide for Version 3. Schroeder, P. R; Lloyd, C. M; Zappi, P. A; Aziz, N. M.	PB95212692	1994	112 pages
Hydrologic Evaluation of Landfill Performance (HELP) Model: Engineering Documentation for Version 3. Schroeder, P. R; Dozier, T. S; Zappi, P. A; McEnroe, B. M; Sjostrom, J. W; Peyton, R. L.	PB95212700	1994	134 pages