Scaled logs of drill holes printed on paper from coal bearing rocks of western Pa.
POC is Bill Bragonier. unit of measurement is paper strip log of drill records.
Scaled strip logs of drill holes from western Pa. Estimated between 5,000-10,000 drill holes. Some are filed by county, some by quadrangle and some are not filed. Most consist of folded paper approx. 4-5 inches wide.