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National Research Council (U.S.). Subcommittee on the Ninth Edition of the RDAs, National Institutes of Health (U.S.), and National Research Council (U.S.). Committee on Dietary Allowances. Recommended Dietary Allowances. 9th ed. Washington, D.C.: National Academy Press, 1980.

National Research Council (U.S.). Subcommittee on the Ninth Edition of the RDAs, et al. Recommended Dietary Allowances. 9th ed. National Academy Press, 1980.