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January 1, 1976

Magnetic horizontal intensity in the United States; epoch 1975.0

No abstract available.

January 1, 1976

Magnetic inclination in the United States; epoch 1975.0

No abstract available.

January 1, 1976

Magnetic total intensity in the United States; epoch, 1975.0

No abstract available.

January 1, 1976

Magnetic vertical intensity in the United States; epoch 1975.0

No abstract available.

January 1, 1976

Map of coal-mining features, Allegheny County, Pennsylvania

This map is one result of a series of studies sponsored by the Appalachian Regional Commission as part of a larger U.S. Geological Survey program of environmental analysis of a part of southwestern Pennsylvania. The map summarizes surface features resulting from coal mining. The distribution of surface features is largely from 1973, 1:12,000 scale aerial photographs verified by field reconnaissanc

January 1, 1976