The method 4 wherein the amount of hydrogen introduced into said coal bed formation is within the range of 0.2–1.0 standard cubic feet for {TAIL ~ each cubic foot} of methane recovered from {HEAD ~ said coal bed formation} 
The method 4 wherein the amount of hydrogen introduced into said coal bed formation is within the range of 0.2–1.0 standard cubic feet for { TAIL ~ each cubic foot } of methane recovered from { HEAD ~ said 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 OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD