Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Sangano racho rakaumbwa musi wa6 (18) August 1845 muSaint Petersburg, Russia. Pamberi peRussian Revolution ya1917, yaizivikanwa seImperial Russian Geographical Society.  Mubvunzo: chii chaiva sangano rakaumbwa muna 1845
Imperial Russian Geographical Society