1903 Post route map of the territory of Hawaii, Samoan Islands and the island of Guam showing post offices in operation on the 1st of December, 1903, by the US Post Office, from the Digital Commonwealth - commonwealth cj82kn241. (<a rel="nofollow" class="external free" href="https://www.digitalcommonwealth.org/search/commonwealth:cj82kn241">https://www.digitalcommonwealth.org/search/commonwealth:cj82kn241</a>)
US Post Office
Digital Commonwealth