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