RACE,INITIAL CONTACT (SOR REMOVED)
Note that for each of: Z_IRSO,Z_RRSO,Z_R2SO, Z_CRSO, Some
Other Race (SOR) has been removed from all Two or more race
responses. The single race SOR remains.
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Taken from: Census Quality Survey Public Use Data File, 2001: [United States] - Census Quality Survey Data.