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In this book the author offers an ingenious series of charts and a celluloid wheel together with brief explanation of the so-called safe period and practice of this method in relationship to birth control. Dr. Welton is inclined to believe that the method has value. He discusses the literature pro and con emanating from various places. His book should be most useful to those who care to try this method.
The Modern Method of Birth Control. JAMA. 1935;104(26):2391. doi:10.1001/jama.1935.02760260079042