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Ancestry.com - District of Columbia Census, 1800-90
AIS indexes. Original source: Jackson, Ronald V., Accelerated Indexing Systems, comp.. District of Columbia Census, 1800-90 [database on-line]. Provo, UT, USA: The Generations Network, Inc., 1999. Original data: Compiled and digitized by Mr. Jackson and AIS from microfilmed schedules of the U.S. Federal Decennial Census, territorial/state censuses, and/or census substitutes.