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<br />~. <br />DATA BASE FILE: 6eoarchive <br />ITEM DESCRIPTORS: <br />Pitch? or Dip? or Inclin? and Coal and Subsidence <br />CITATIONS: (Total 1) <br />Deternilnations of protection pillars for objects and plants on the <br />surface by exploitation of horizontal and imperceptible inclined <br />coal beds on the areas of the Upper Silesia Industrial Region. <br />C~ <br /> <br />A-6 <br />