Map of the Chaco Boreal [cartographic material] / compiled by the American Geographical Society of New York.American Geographical Society of New York1929"Contours and altitudes in meters."Relief shown by contours and spot heights. River depths shown by soundings.Shows rivers - surveyed and unsurveyed, astronomical points, roads, trails, fortines/[bunkers] (Bolivian, Paraguayan or Argentine), settlements, indian settlements and mission stations.cartographic