Relief shown by hypsometric tints and spot heights.
One of five sheets, on bipolar oblique conic conformal projection, designed to permit fitting together as a unit, to form the society's "Map of the Americas. 1:5,000,000."
Inset: [Key map].
Annotated to show pipe lines etc.
"This shows the network of pipe lines used for transporting crude petroleum and petroleum products in the United States about September 1948. Data from the map, "Oil and Gas Fields of the United States," published by U.S. Geological Survey in 1946, and from the map of crude-oil pipe lines, product lines, and refineries issued by the Oil and Gas Journal as a supplement to its September 23, 1949, issue."