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