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SURPAK Method of Evaluation and Reduction of Unnecessary Radiation Exposure to the Public from Dental Radiography

Samuel Sperling

出版	Division of Radiological Health, Public Health Service, U.S. Department of Health, Education and Welfare, 1961
URL	http://books.google.com.hk/books?id=-3HcMgAACAAJ&hl=&source=gbs_api