Miscellaneous References and Mentions

While our initial information about Gratis came from various goverment sources (GNIS), we also found mention of Gratis 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 Gratis. We hope that they will be useful to you.

Note: When we started collecting data about Gratis, we were inconsistent about keeping track of where that data came from. As a result, this list of references and mentions is probably incomplete.

Gratis is contained in a comprehensive list of Post Offices that was created by Cameron Blevins and Richard Helbock.<1>

The GNIS database contains an entry for Gratis. See our Misc Page for Gratis for more information.