Before you search any database, determine the time period and geographic region it actually covers. The title may say “Ohio Marriages 1810-1860” but there may be counties not included at all or there may be counties where the records only go from 1820-1850. That database of Dawson County, Nebraska, death records from 1880-1920 may not include any entries from 1902 because that volume is missing. That set of Carthage Democrat newspapers may have years not included because they could not be found. The same goes for any print publication. For a book, read the preface. For a database, look at the list of contents, read the frequently asked questions (or the “more about section), or contact the compiler to determine just what is included. Not everything is complete.
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