Earth Sciences

The Forms of Water in Clouds and Rivers, Ice and Glaciers

The Earth's Beginning

The Bermuda Triangle Parado

Essay on the Theory of the Earth

Inside Illinois: Mineral Resources

The aneroid barometer: its construction and use

Urban Exploration Tips

Deep Cave Descents

Arctic Night Wonders

Soaring Glider Flights

Jungle Camp Advice

Navigation Without Tools

Prairie, Peak, and Plateau: A Guide to the Geology of Colorado

Geology

The Geologic Setting of the John Day Country: Grant County, Oregon

Deep Cave Missions

Arctic Ice Treks

Climate and Time in Their Geological Relations

Desert Dust Cycles

Soil Loss Problem