id	keyword
ajst-1965	fracturing
ajst-1965	technology
ajst-1965	gas
ajst-1965	fluid
ajst-1965	foam
ajst-1965	carbon
ajst-1965	dioxide
ajst-1965	coal
ajst-1965	research
ajst-1965	energy
ajst-1965	methane
ajst-1965	fracturing technology
ajst-1965	bed