Shortage of coal in the northern Appalachian coal field

I. C. WHITE
1909 Geological Society of America Bulletin  
P r e s e n te d b efo re th e S o c ie ty D e c em b e r S I , 1 9 0 8 )
doi:10.1130/gsab-20-333 fatcat:ckpi736mjfco5fopjrpaxloxzm