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Amendment WI 37 (January 17, 2007)
Part 503, Safety.
Amendment WI 36 (January 17, 2007)
Part 501, Authorizations.
Amendment WI 35 (June 26, 2006)
Part 542, Specifications.
Amendment WI 34 (September 21, 2005)
Amendment WI 33 (May 25, 2005)
Part 505, Contractor Technical Services.
Amendment WI 32 (April 21, 2005)
Part 512 - Construction
Part 542, Specification, ASTM Reference List.
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