See <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://digilib.bbaw.de/digilib/digilib.html?fn=projects/avhr/Karten/Ural_1837">Karte vom Ural Gebirge (1837)</ref>. On <persName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0016185">Švecov</persName> as informant, middleman, and draftsman, see “Schwetsoff” in <bibl xmlns="http://www.tei-c.org/ns/1.0" corresp="https://edition-humboldt.de/BH8W3QPH">Rose 1837/1842</bibl>, <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://www.deutschestextarchiv.de/rose_ural01_1837/355">I, 321</ref>–<ref xmlns="http://www.tei-c.org/ns/1.0" target="https://www.deutschestextarchiv.de/rose_ural01_1837/361">327</ref>.