Preferably, hydrogen is introduced into the coal bed in an amount within the range of 0.2–1.0 standard cubic feet of hydrogen for {TAIL ~ each standard cubic foot} of methane recovered from {HEAD ~ the coal bed formation} 
Preferably , hydrogen is introduced into the coal bed in an amount within the range of 0.2–1.0 standard cubic feet of hydrogen for { TAIL ~ each standard cubic foot } of methane recovered from { HEAD ~ the coal bed formation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD