Shows Matochkin Strait and voyage of the Isbjorn through strait in 1879. Route and dates of voyage are shown. Areas of sea ice, including dates of ice obstruction in strait, are shown. Relief shown by hachures and spot heights. Depth shown by soundings. From: Proceedings of the Royal Geographical Society and monthly record of geography. Vol. 2 (1880), no. 1, pp. 1-40; held in Firestone Library. Call number: G7 .J6873