agsrs.dat - The n=300 sample from agpop used in the text.
agstrat.dat - The n=300 stratified sample from agpop used in the text.
counties.dat - A SRS sample of size n=100 used in problem 4.11.
statepop.dat - A pps sample of size n=100 used in Example 6.5 and Problems 6.12 and 6.13.