Poker Peak, Idaho - 7.5 Minute Series Topo Map Pony Express and Gregg S

and Gregg S

Dan Plazak provides an entertaining and informative volume that's a treat for anyone with an interest in Western mining history

Mount Hancock

From Alibates Flint Quarries National Monument in Texas to the Zuni-Acoma T Rail in New Mexico

and historical information are noted throughout the text

Poker Peak, Idaho - 7.5 Minute Series Topo Map Pony Express and Gregg SThe 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