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Ancestry.com - Search Immigration & Travel
Passenger lists, citizenship, naturalization, and other immigration sources. Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription. Free articles and helpful research materials.
Colorado Historical Records Index
A name index database that has been compiled from historical records in the State Archives' custody. Researchers may type in the name of their relative and hit the search button to see those entries that have been recorded. The information found will identify the type of record the name was found in (i.e. prison record), what county it is from and the date of the record. This index will be expanded monthly as new information is added to the database. Record types include: probate, court cases, naturalizations, pensions, birth, marriage, divorce, death, land and much more.
Colorado State Archives Naturalization Records
Excellent site providing information on the naturalization process in general complete with scanned documents as examples. Gives an inventory of the naturalization records held by the Archives on a county-by-county basis.