hough not actually a part of the Family History
Library Catalogue, it is a portion of the start-up collection for
every FHC. This collection is a microfiche index to the US Census
and some Census substitutes. Since it is a compilation of printed
Census indexes published by AIS, with indexing done by untrained
researchers, the fiche index will contain the same errors as the
printed volumes plus typos and other errors. Additionally, no
verification or editing of AIS indexing was done. In spite of an
overall error rate of 19%, these searches are valuable in
locating migration patterns and helps identify various surname
spellings as long as the researcher keeps the error rate in mind.
The AIS covers mainly 1790 to 1850 but some earlier and later
records are included. The searches have missed names that should
have been included from the original record. If your ancestor
does not appear on the AIS search, return to the original record
to see if he and she is listed there.
The AIS contains typos and transposition errors, i.e. NESLON rather than NELSON. Some people appear twice on a search. The format of some entries within a search is inconsistent. Some countries were indexed under the wrong census year and some county abbreviations are confusing.
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