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Simpson, Gumpertz & Heger.
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Structural plastics design manual : phase I, chapters 1-4 / Simpson, Gumpertz & Heger.
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United States. Federal Highway Administration.
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"Simpson, Gumpertz and Heger, Inc."--1st prelim, p.
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McGrath, T. J. (Timothy J.)
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Simpson, Gumpertz & Heger.
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Petersen, D. Lee.
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Performed by CNA Consulting Engineers and Simpson Gumpertz & Heger Inc.
by
Heger, Frank J.
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Simpson Gumpertz & Heger,