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1. [1990 Census of population and housing : Public Law 94-171 data : technical documentation : user notes 1-5 and technical notes 1-11].
   C 3.281:P 81/DOC
2. 1990 census of population and housing. Special tabulation program (STP 14), special tabulation on aging on CD-ROM : technical documentation
   C 3.281/2:AG 4/DOC.