I think I know what Ancestry.com’s “Northern District, Illinois, Naturalization Index, 1926-1979” is, but I’m not certain. The title of the database (“Northern District, Illinois, Naturalization Index, 1926-1979“) seems slightly inconsistent with the “Original Data” as Ancestry.com refers to the source of their data.
There are two items under the “Source Information” for this database–and for all Ancestry.com databases. The first item is the citation Ancestry.com provides for this specific database. The second item (“Original data”) is where Ancestry.com obtained the information.
I’m not certain that’s correct.
Based upon the “name ranges” used to browse this collection, the original data appears to be “Illinois, Northern District (Eastern Division), Naturalization Index, 1926-1979,” as published on FamilySearch and not the 1840-1950 index referenced on the webpage at Ancestry.com for this database.
Hopefully I’ll get an answer or response to this to confirm what really is going on.
Stay tuned.
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