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Theory of ballooning.
A general guide to piloting a free balloon.
Date:
April 25, 1940
Creator:
United States. War Department.
System:
The UNT Digital Library
Powdery Mildew of Ornamental Plants.
Describes the powdery mildew fungus and methods for its control.
Date:
April 1940
Creator:
Weiss, Freeman
System:
The UNT Digital Library
Work of the United States Forest Service.
Discusses forest depletion and provides a history of forest conservation efforts by the United States government. Describes the work of the the Civilian Conservation Corps and other emergency projects, and discusses forest and range research.
Date:
April 1940
Creator:
United States. Forest Service.
System:
The UNT Digital Library