General Revision Act
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The General Revision Act of 1891 repealed the Timber Culture and Preemption Acts and authorized the President of the United States, under the Forest Reserve Act, to create forest preserves "wholly or in part covered with timber or undergrowth, whether of commercial value or not...."
Over 1,200,000 acres (4,900 km²) of forest lands were set aside for federal use in the Yellowstone region. President Benjamin Harrison set aside 14 other areas of forest land by proclamation.

