Vital Statistics of the United States

These files cover the Births or Natality chapters of the published volumes of vital statistics from the US National Center for Health Statistics for the period 1931 through 1968. In the 1937 report you could find the Puerto Rico supplement. They have the same content as the files at http://www.cdc.gov/nchs/products/vsus.htm but are compressed. Acrobat 5.0 or better is required to view them.