The SciencesJune 12, 1920
Machinery for the Sugar-Beet Field, Mowing with the Tractor
Stories by W. F. Wilcox
The SciencesJanuary 31, 1920
Mountain-Peak Grazing
How the Western Sheep-Growers Are Spreading Out Their Field of Operations Toward the Sky
The SciencesDecember 13, 1919
First Underground Mining Mill in America
EnvironmentJuly 13, 1918
Mountains of Oil
Vast Quantities of Petroleum To Be Extracted from the Shale Cliffs of Colorado
The SciencesJanuary 29, 1916
San Miguel River Canyon Flume—A Monument of Gold Mining Failure, Destruction of Vegetation by Fumes from Smelters and more