
The Subjugation of the Colorado
Substituting Power, Light and Fertile Lands for Disastrous Flood Waters

The Subjugation of the Colorado
Substituting Power, Light and Fertile Lands for Disastrous Flood Waters

Gasoline from Natural Gas
How $200,000,000 a Year is Saved from Waste, and a Billion Gallons Added to the Gasoline Supply

Our Strenuous Geological Survey--IV
With the Men Who Have Penetrated and Mapped the Wilds of Alaska

Our Strenuous Geological Survey--III
How Geologists and Water Engineers Keep Track of Our Natural Resources

Our Strenuous Geological Survey--II
Some of the Incidents of Topographic Work that Are Not on the Program

Our Strenuous Geological Survey--I
What it means to make a Topographic Map of the United States