For other articles in the Britannica Book of the Year series, see Birth Control, 1941 ; Birth Control, 1942 ; Birth Control, 1943 ; Birth Control, 1945 ; Birth Control, 1946 ; Birth Control, 1947 ; Birth Control, 1948 ; Birth Control, 1949 ; Birth…
For other versions see Margaret Sanger Papers Microfilm: Smith College Collections, S71:274 and
Margaret Sanger Papers Microfilm,cLibrary of Congress, LCM 131:0489 LCM:493.