This invention relates to {HEAD ~ a method} for the storage of hydrogen in subterranean carbonaceous formations and, more particularly, to {TAIL ~ the storage} of hydrogen in coal beds which have been at least partially depleted of methane 
This invention relates to { HEAD ~ a method } for the storage of hydrogen in subterranean carbonaceous formations and , more particularly , to { TAIL ~ the storage } of hydrogen in coal beds which have been at least partially depleted of methane
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