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For other articles in the Britannica Book of the Year series, "Birth Control," 1946-1958, see Margaret Sanger Papers Microfilm Edition: Collected Documents Series: 1944; 1946; 1947; …

For draft version, "One of Eleven," see Margaret Sanger Papers, Library of Congress Microfilm LCM 130:419.

This article is the second in a four-part series of the same title. For Part I see July 1923; for two following articles see Sept. 1923 and Oct. 1923.

This article is the first of a five-part series of the same title. For following articles see Aug. 1923, Sep. 1923, and for art IV and V Oct. 1923.

For Sanger's interview with R. C. Martens, "A Birth Strike to Avert World Famine," Birth Control Review, Jan. 1920, p. 3.