Miscellaneous References and Mentions

While our initial information about Doubling Gap came from various goverment sources (GNIS, FIPS), we also found mention of Doubling Gap in various books and other sources.

We've created the following list to keep track of the sources that proved useful in adding to our knowledge about Doubling Gap. We hope that they will be useful to you.

Note: Initially, we were careless about keeping track of where our Doubling Gap data came from. The following list of references and mentions is incomplete.

Doubling Gap 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 Doubling Gap. See our Misc Page for Doubling Gap for more information.