EXPLOITATION OF COAL DEPOSITS IN BULGARIAN PEOPLE'S REPUBLIC by A. N. Shcherban' -- THE GAS INDUSTRY DURING THE THIRD FIVE-YEAR PLAN -- THE IMPORTANCE OF INVESTMENT CONSTRUCTION IN FULFILLING ECONOMIC-POLITICAL TASKS OF THE COAL INDUSTRY by Liboslav Stanek -- PROSPECTS AND POSSIBILITIES OF SHORTER WORKING HOURS IN MINING by Stanislav Hachran.
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