Jackson Lake, Wyoming - 30x60 Minute USGS Topographic Map Basic Illustrated • Inch/centimeter rulers (global) or

• Inch/centimeter rulers (global) or metric scales (metric only) for accurate and effective map work

It covers the entire Four Corners Region including the southern halves of Utah and Colorado

and (3) the feasibility of secondary oil recovery from the lower Green River reservoir

Geological Survey Miscellaneous Investigation Series Map I-1997

Jackson Lake, Wyoming - 30x60 Minute USGS Topographic Map Basic Illustrated • Inch/centimeter rulers (global) orThe distinctive characteristic of a topographic map is that the shape of the Earth's surface is shown by contour lines. Contours are imaginary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steepness of slopes. A topographic map shows more than contours. The map also includes