Includes bibliographical references (pages 27-33).
Also issued in paper form.
Electronic reproduction. Washington, D.C. : Population Division, U.S. Census Bureau, 200u.
System requirements: Adobe Acrobat Reader.
Mode of access: Internet from the Census Bureau web site. Address as of 6/4/03: http://www.census.gov/population/documentation/twps0059/twps0059.pdf; current access is available via PURL.