Flora fossilis arctica - Heer, Oswald <1809-1883>. (OLS)http://semarc/name/89251 (Friedrich Schulthess : [poi]... Winterthur : Wurster & Comp.,, 1868)
Keywords: Regioni artiche - Botanica. (OLS)http://semarc/subject/44569; Paleobotanica. (OLS)http://semarc/subject/44570