312 W Whipple, George Chandler, 1866-1924 Vital statistics; an introduction to the Science of demography, by George Chandler Whipple... 2d ed. New York, John Wiley & sons, inc.; etc., etc.j 1919. xiv, 579 p. incl. illus., tables, diagrs. 18 cm. "References": p. 519-524