Notes: | Relief shown by contours and spot heights. Titles below map : Fig.1. Map of the Troublesome quadrangle, Kentucky, showing the outcrop of the principal coal beds and the structure of the Fire Clay Coal Bed -- Fig.2. Map of the Troublesome quadrangle, Kentucky, showing the mined areas and thicknesses of the principal coal beds. At head of sheet: "Department of the Interior, United States Geological Survey ; prepared with the cooperation of the University of Kentucky and the Kentucky Geological Survey." Includes text, 2 index maps, cross section, 4 columnar sections, and graphic coal sections. Includes bibliographical references.
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