QUESTIONS OF GROWTH AND DRIFTAGE TESTIMONY OF A 

 BLOCK OF COAL UNDER THE MICROSCOPE DIFFERENT 

 KINDS OF COAL CONDITIONS NECESSARY TO ACCUMU- 

 LATION IN SITU COAL BEDS AND THEIR ACCOMPANI- 

 MENTS UNDERCLAYS AND ROOFS VEGETABLE REMAINS 

 HISTORY OF COAL GROUPS SUMMARY OF EVIDENCE 

 SUBSIDENCE OF COAL AREAS STIGMARIA AND OTHER 

 COAL PLANTS LATER COAL ACCUMULATIONS THE 

 STORY AND USES OF COAL 



