[Correspondence] May 16, July 28, August 27, November 5, 1969, [about proposed specifications for asphalt cement] / Norman W. McLeod and Woodrow J. Halstead .
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Halstead, Woodrow J.
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South Dakota. Dept. of Highways.
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Imperial Oil Limited
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American Association of State Highway Officials. Committee on Materials
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Anderson, Donald W.
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McLeod, Norman W.
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