Q21. Does the GSS use the most recent Census for its sampling frame?

Not necessarily. In 1983 and again in 1993 there were sample frame experiments that are described in Appendix A. In 1983 806 cases were from the 1970 frame (SAMPLE=3) and 793 cases from the 1980 frame (SAMPLE=6). In 1993 817 cases were from the 1980 frame (SAMPLE=6) and 789 case from the 1990 frame (SAMPLE=8).