(WO9512743-A1)      Method for reducing the amt. of an inert methane-desorbing gas present in a methane-contg. gaseous mixt. produced from a solid carbonaceous subterranean formation, comprises (a) injecting an inert methane-desorbing gas into the formation; (b) thereafter suspending injection of the methane-desorbing gas; (c) recovering a first methane-contg. gaseous mixt. from the formation during at least a portion of the injection step, the mixt. having a first methane-desorbing gas vol.%; and (d) recovering a second methane-contg. gaseous mixt. from the formation after performing the suspending step, the second gaseous mixt. having a second methane-desorbing gas vol.% less than the first methane-desorbing gas vol.%.    USE -   Reducing concn. of inert methane-desorbing gas in methane-contg. mixts.    ADVANTAGE -   The concn. of inert methane-desorbing gas is reduced by injecting inert gas into solid carbonaceous subterranean coalbed formations, mitigating cost of removing inert gas from methane prod.    (ZA9408601-A)      Method for reducing the amt. of an inert methane-desorbing gas present in a methane-contg. gaseous mixt. produced from a solid carbonaceous subterranean formation, comprises (a) injecting an inert methane-desorbing gas into the formation; (b) thereafter suspending injection of the methane-desorbing gas; (c) recovering a first methane-contg. gaseous mixt. from the formation during at least a portion of the injection step, the mixt. having a first methane-desorbing gas vol.%; and (d) recovering a second methane-contg. gaseous mixt. from the formation after performing the suspending step, the second gaseous mixt. having a second methane-desorbing gas vol.% less than the first methane-desorbing gas vol.%.    USE -   Reducing concn. of inert methane-desorbing gas in methane-contg. mixts.    ADVANTAGE -   The concn. of inert methane-desorbing gas is reduced by injecting inert gas into solid carbonaceous subterranean coalbed formations, mitigating cost of removing inert gas from methane prod.