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Academia.edu is a platform for academics to share research papers. Browse subject:Roads -- Periodicals The Online Books PagePendulum impact tests of wooden and steel highway guardrail posts / (Upper Darby, Pa. :Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station, 1974), by Charles J. Gatchell and Jarvis Dale Michie (page images at HathiTrust)

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