1892
Karl von Ditmar, Estonian-German geologist and explorer (born 1822)
Karl von Ditmar, Estonian-German geologist and explorer (born 1822)
Karl von Ditmar, Estonian-German geologist and explorer (born 1822)
Baltic German geologist and explorer
Karl von Ditmar, Estonian-German geologist and explorer (born 1822)
Karl von Ditmar, Estonian-German geologist and explorer (born 1822)
Karl von Ditmar, German geologist and explorer (died 1892)
Karl von Ditmar, German geologist and explorer (died 1892)