Disc 1. Historic data: 1970 long form, release 2.0; 1980 long form, release 2.2; 1990 long form, release 1.1; 1990 blocks, release 1.1
Disc 2. 2000 short form & redistricting: short form, release 1.1; short form blocks, release 1.1; redistricting, release 1.3; redistricting blocks, release 2.2
Disc 3. Normalized data: 1990 LF in 2000, release 1.1; NCDB, release 1.1; 2000 long form, release 2.2.