Reader which is available for free from the Adobe web site. It also contains a table that shows the year of the first census in which a county appeared, and the census since which it has not had a significant boundary change.
Notes provide information on how the county was formed, changes in the county names, and more.
NTIS also sells a diskette version for the same price. Extract of the historical census data . The 1970 and 1980 census counts from this source are revised from the tabulated versions. Sorted by 1990 population size Table 2. Population Division Working Paper No.