The views and opinions expressed in this editorial are solely those of the author and do not necessarily represent those of the U.S. government or its subsidiaries. No endorsement of any product, material, program or the like mentioned in the proceeding is intended or implied.
U.S. Bureau of the Census. (1975a). Historical statistics of the United States: Colonial times to 1970, Part 1 (Bicentennial ed.). Washington, DC: U.S. Government Printing Office.
5.
U.S. Bureau of the Census. (1975b). Historical statistics of the United States: Colonial times to 1970, Part 2 (Bicentennial ed.).Washington, DC: U.S. Government Printing Office.
