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V ' t l fel Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL TOXICOLOGICAL LEGAL oo t=3 APRIL, 1964 (Vol. 28, No. 4) INDUSTRIAL HYGIENE FOUNDATION! MELLON INSTITUTE 4400 FIFTH AVENUE PITTSBURGH, PA. 1S213 SC-ALL-11461 SCF-ALLF-02490 _________ / 03121397