1 The full report, from which this article is taken, has appeared as Publication 983, National Academy of Sciences—National Research Council, Washington, D. C., 1962.
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1 The full report, from which this article is taken, has appeared as Publication 983, National Academy of Sciences—National Research Council, Washington, D. C., 1962.
1 The full report, from which this article is taken, has appeared as Publication 983, National Academy of Sciences—National Research Council, Washington, D. C., 1962.