A study of Illinois coals : with a new method for determining their calorific value . «4 6o o ( y ro v. 1 3 v O Ov i P o 1 -5 rv «?> si •) V 5 vT- V \ t> sS (•0 h O V \jv rvrv - 2 rv» p\1 rv u > - N r- rlS. s^* bo ro. 3

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcoal, booksubjectthes