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Graphical Analysis of the CCRL Portland Cement Proficiency Sample Database (Samples 1-72).
National Institute of Standards and Technology, Gaithersburg, MD
NISTIR 5387,
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Pielert, J. H.; Spellerberg, P. A.
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AASHTO Materials Reference Laboratory: Thirty Years of Service to the Transportation Community.
National Institute of Standards and Technology, Gaithersburg, MD
TR News,
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March/April 1996
Spellerberg, P. A.; Trimm, W. L.; Pielert, J. H.
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Development and Application of a Quality System Standard for Construction Materials Testing Laboratories.
National Institute of Standards and Technology, Gaithersburg, MD; Missouri Highway and Transportation Department, Jefferson City, MO
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American Society for Testing and Materials. Laboratory Operation and Accreditation, 3rd Symposium. Proceedings. December 9, 1993,
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['1993', '1996']