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