TY  - BOOK
ED  - Estados Unidos. Bureau of the Census
TI  - Historical statistics of the United States: colonial times to 1970. Bicentennial edition
PY  - 1975///
CY  - Washington, D.C.
PB  - U.S. Department of Commerce
KW  - ESTADISTICA
KW  - HISTORIA ESTADOUNIDENSE
KW  - ESTADOS UNIDOS
ER  -