00527nam a22001337a 4500008004100000040005500041100000300096245011400099260007800213300001000291490006600301650001300367653001300380230705b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library    aOrigin of coal deposits c/ Proceedings of section 11, report of the twenty-third session czechoslovakia 1968  aBratislava: bThe Geological Survey of Czechoslovakia in Academia: c1968  a134p.  aInternational geological congress vXXIII session Prague 1968  aScience   aGeology