Miscellaneous References and MentionsWhile our initial information about Callao came from various goverment sources (GNIS, FIPS), we also found mention of Callao in various books, maps and other sources. We've created the following list to keep track of the sources that proved useful in adding to our knowledge about Callao. We hope that they will be useful to you. Note: Initially, we were careless about keeping track of where our Callao data came from. The following list of references and mentions is incomplete. Rand McNally Map of Virginia (1911)
Callao is contained in a comprehensive list of Post Offices that was created by Cameron Blevins and Richard Helbock.<1> Both the GNIS and FIPS databases contain entries for Callao. See our Misc Page for Callao for more information. Footnotes ...
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