QUESTION: --------- Sampling PSU-county code 1964-1976 NOTES: ------ See Appendix "COUNTY CODE" (part II). Coded 001-993 and: WEIGHT: ------- VCF0009/VCF0009a TYPE: ----- Numeric Dec 0 SOURCE_VARS: ------------ 1964: 640004 1966: 660003 1968: 680017 1970: 700021 1972: 720008 1974: 742009 1976: 763009