LEADER 00000nam 2200229 a 4500 001 0065630 003 UkHlHU 007 t 008 002807 0 1938 000 eng 040 UkHlHU 050 4 HD 9540 I6 110 2 International Labour Office. 245 04 The world coal-mining industry. 260 Geneva :|bInternational Labour Office,|c1938. 300 2v. 440 0 Studies and reports; series B economic conditions ;|vno.31 946 6XX absent
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