Kart fra Nasjonalbibliotekets kartsamling. Kartet er gitt ut i  () og viser Slesvig, Holstein.
<bdi><a href="https://www.wikidata.org/wiki/Q91086" class="extiw" title="d:Q91086"><span title="German mathematician and cartographer">Johannes Mejer</span></a>
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<bdi><a href="https://en.wikipedia.org/wiki/en:National_Library_of_Norway" class="extiw" title="w:en:National Library of Norway"><span title="national library">National Library of Norway</span></a>
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