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 produced after the Census Bureau had conducted a boundary review in two phases.

In the first phase of the Tribal Review Program, the Census Bureau obtained maps of the new boundaries from the certifying agencies (the BIA and the appropriate State authorities) or sought confirmation from these authorities that the boundary locations had not changed since January 1, 1980. The Census Bureau then sent these maps to the respective tribal governments. The tribal officials reviewed the maps and contacted the BIA or the State certifying official if they found problems with the boundaries. After working with tribal officials to resolve such problems, the certifying agency or official then recertified the boundary and sent the corrected information to the Census Bureau.

In the second phase of the Tribal Review Program, tribal officials identified any remaining concerns about the boundaries and submitted them directly to the Census Bureau. The process continued until mid-1989 when the Census Bureau produced the first set of computer-derived maps showing the American Indian reservation and trust land boundaries. The Census Bureau sent these maps, called the Tribal Review Maps, to the tribes for approval and one more opportunity for correction. The Census Bureau then took the responsibility for presenting that revision/correction to the BIA or the State certifying official, and, upon certification, changing the boundary in the TIGER data base.

The Tribal Review Program was very successful in improving the accuracy of the reservation and trust land information used for the 1990 census. It identified 310 reservations: 298 Federally recognized and 12 State-recognized. Four of the Federally recognized reservations consisted of trust land areas that had certified boundaries, thereby defining entities equivalent to a reservation for decennial census purposes; 52 other Federally recognized reservations had tribal and/or individual trust lands associated with them. American Indian and Alaska Native Areas5-11