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ASTM D 2521 - 76 ; ASTM D 2521 - 76 (Reapproved 2002) Standard specification for asphalt used in canal, ditch and pond lining
1) 1997 Annual book of ASTM Standards Section 4, Volume 04.04 Roofing, waterproofing, and bituminous materials 2) 2005 Annual Book of ASTM Standards Section 4 Construction, Vol. 04.04 Roofing and Waterproofing
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