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Field fortifications

Description: "This manual describes field fortification methods and gives details of construction of entrenchments, emplacements, and shelters. It also outlines the principles of terrain appreciation which apply to field fortifications, and explains how to combine individual field fortifications into a unified system by means of organization of the ground."
Date: February 14, 1944
Creator: United States. War Department.
open access

Notes on frost.

Description: Discusses the seasons of frost and how frost is formed, protection from frosts in various circumstances, and general observations.
Date: December 14, 1910
Creator: United States. Department of Agriculture.
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