Air navigation map, South America /
United States.Army.Corps of Engineers.
Washington, D.C. : The Corps of Engineers,
1940-
Relief shown by contours and spot heights. Depths shown by isolines.
Some sheets bear title: South America 1:500,000 ...
Set includes various issues of some sheets, some by U.S. Army Map Service.
Sheets individually titled and numbered.
In upper margin: Unedited provisional edition subject to correction.
In addition to aeronautical information, three classes of roads or trails and three classes of railroads are shown.
"Base from American Geographical Society map."
Marginal diagrams: Sheet index -- Relative reliability.
Incomplete: Graphic indexes with maps, (covers northern South America & most of Brazil).
Aeronautical charts