1969 年 85 巻 978 号 p. 889-893
The committee of the underground gasification had been organized in the Ministry of International Trade and Industry in 1965-67, and planned the underground gasification trial at Naie in Hokkaido.The members of the committee continually planned the underground gasification trial at Takamatsu in Kyushu.
These plans cannot be carried out at present, but we published this paper for future reference.
I think that we must keep up the underground gasification of coal.