A method for {HEAD ~ the storage} of {TAIL ~ hydrogen} within a subterranean solid carbonaceous formation such as a coal seam 
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A method for { HEAD ~ the storage } of { TAIL ~ hydrogen } within a subterranean solid carbonaceous formation such as a coal seam
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH