Page:Library of Congress Classification Outline.djvu/289

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Subclass TN

TN1-997 Mining engineering. Metallurgy
TN263-271   Mineral deposits. Metallic ore deposits. Prospecting
TN275-325 Practical mining operations. Safety measures
TN331-347 Mine transportation, haulage and hoisting. Mining machinery
TN400-580 Ore deposits and mining of particular metals
TN600-799 Metallurgy
TN799.5-948 Nonmetallic minerals
TN950-997 Building and ornamental stones