Seminar of the United Nations Economic Commission for Europe,
Improved techniques for the extraction of primary forms of energy / Seminar of the United Nations Economic Commission for Europe
Improved techniques for the extraction of primary forms of energy / Seminar of the United Nations Economic Commission for Europe
. - [London] : Graham & Trotman, [1983]
. - VII, 198 p. 31 cm
0-86010-439-7
536.7