A study of Illinois coals : with a new method for determining their calorific value . f . i V *• * 0?x> > J. x»0 rx 0 Ox Ox, ii -9 N, • X. X j «N PS 6 «i £ i? 0 C» o PX * to fi 5 xB ». 1 1 5.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcoal, booksubjectthes