1867 North western America showing the territory ceded by Russia to the United States, by A. Lindenkohl, United States Coast Survey, from the Digital Commonwealth - commonwealth 4m90fb81t. (<a rel="nofollow" class="external free" href="https://www.digitalcommonwealth.org/search/commonwealth:4m90fb81t">https://www.digitalcommonwealth.org/search/commonwealth:4m90fb81t</a>)
A. Lindenkohl, United States Coast Survey
Digital Commonwealth