Report discussing radioactivity measurements of samples of coal and associated rock that were collected during a reconnaissance study in the coal fields of eastern Kentucky, as well as Logan and Mingo counties, West Virginia.

From introduction: The purpose of the field work was to investigate the geology of the county, particularly the structure or lay of the oil-bearing strata and the results of drilling to date. Structural conditions in the producing fields were determined by running level lines to the wells and correlating the data recorded in the well logs generously furnished by the operators.