American Birds Realistically Mounted
The Duck Hawk. Hackensack Meadow, and Egret Groups
The Duck Hawk. Hackensack Meadow, and Egret Groups
How it May be Concretely conceived
Human Energy and Its Expenditure
2.000 Billion Tons of Coal Available
Some Suggestions of Practi Cal Importance
Military Tactics and the Dirigible Airship
The Probable Development of the Explosive and the Projectile
Its History and Present Status
Future Possibilities