Rotary drilling techniques used in the Beckley coalbedTobias W. Goodman · First published 1989Open the Tome
Comparisons between cross-measure boreholes and surface gob holesTobias W. Goodman · First published 1986Open the Tome
Degasification study from an air shaft in the Beckley CoalbedTobias W. Goodman · First published 1982Open the Tome
