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Occurrence of Explosive Gases in Coal Mines
From Introduction: "This report presents the results of an investigation begun by the Government in the summer of 1907, the investigation being started under the immediate supervision of Dr. J. A Holmes and continued under him as director after it was transferred to the Bureau of Mines in 1910, the field studies being completed in the spring of 1912. The purpose of the investigation was to obtain information on the origin of the inflammable gases in coal and the conditions under which they occur."
Date:
1915
Creator:
Darton, N. H.
Object Type:
Report
System:
The UNT Digital Library
The Roundheaded Apple-Tree Borer
This report discusses the roundheaded apple-tree borer, an insect in the eastern and midwestern United States that, in its larval stage, destroys the bark and wood of apple trees. Several methods of control are discussed, including worming, paints and washes, and sprays.Apple-tree borers.
Date:
1915
Creator:
Brooks, Fred E.
Object Type:
Pamphlet
System:
The UNT Digital Library