1175.    GÉNIE CIVIL.  [Underground Gasification of Coals in the U.S.S.R.]  Vol. 122, No. 9, 1945, pp. 66-68.

       Gives general review of the methods followed in Russia.  (See abs. 1, 1628, 3698).  The operation may be so varied that different types of gases for different specific uses can be produced as, for example, for the synthesis of NH₃ or hydrocarbons by the Fischer-Tropsch process.  The average cost of gas produced in this way is about 1/3 that of the producer gas, and the cost of plant therefore about 60-70% of the cost of water-gas plant.