Roraima, Brazil 1939

Provisional edition.Relief shown by contours, hypsometric tints and spot heights.; "Published under the patronage of A. Hamilton Rice."; Includes synoptical index, relative reliability diagram, index to adjoining sheets, note and legend.; "N. A-20.";Color;Scale 1:1,000,000 (W 66°--W 60°/N 4°--N 0°).