Explorers - Biography - Juvenile literature. - United States

Exploring the earth with John Wesley Powell by: (Language materials, printed)

Powell, John Wesley,

Explorers- United States

Colorado River (Colo.-Mexico)- Discovery and exploration

Grand Canyon (Ariz.)- Discovery and exploration

West (U.S.)- Discovery and exploration

Geology- Study and teaching

Explorers.

Geologists.

Colorado River (Colo.-Mexico)- Discovery and exploration.

Grand Canyon (Ariz.)- Discovery and exploration.

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