Geologists - Biography. - United States

A passion for gold : = an autobiography / by: (Language materials, printed)

Grand Canyon : = solving Earth's grandest puzzle / by: (Language materials, printed)

King of the 40th parallel : = discovery in the American West / by: (Language materials, printed)

Seeing things whole : = the essential John Wesley Powell / by: (Language materials, printed)

Geology- Colorado River Watershed (Colo.-Mexico)

West (U.S.)- Environmental conditions.

Grand Canyon (Ariz.)

King, Clarence,

Explorers- United States

Colorado River (Colo.-Mexico)- Description and travel.

West (U.S.)- Description and travel.

Geologists- Biography.- United States

Geology- Arizona

Conservationists- Biography.- United States

Powell, John Wesley,- Philosophy.

Arid regions- West (U.S.).

Grand Canyon (Ariz.)- Description and travel.

Grand Canyon (Ariz.)- Discovery and exploration.

Geological Survey (U.S.)

Geology- Research- Arizona

West (U.S.)- Discovery and exploration.