Miscellaneous References and Mentions

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

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

Business Atlas and Shippers' Guide (1895)
Published by Rand McNally & Co.

A note taken from the Shipper's Guide for Principio:
Services available in 1895: had a Post Office, an Express Office, no Railroad mentioned

North American Railroad Atlas - Northeast
Written by: Walker, Mike
Published by RailfanDepot, 2020
(Available from Amazon.com)

U.S. Post Offices (Oct. 1846)
Published by John T. Towers

Rand McNally Map of Maryland (1911)
Published by Rand McNally & Co.

Principio 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 Principio. See our Misc Page for Principio for more information.