Relief shown by contours, form lines and spot heights; depths by isolines and soundings.; "North America 1:1,000,000," "South [sic] America 1:1,000,000."; Each sheet includes "Synoptical index," reliability diagram and index to adjoining sheets. 57 x 71 centimeters and 56 x 63 centimeters Scale 1:1,000,000 General Map Collection