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HANDBOOK OF THE PETROLEUM INDUSTRY. 



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By far the most comprehensive and authoritative book on all phases of 

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 In Two Volumes — 2070 pages — 6 by 9 —profusely illustrated — flexibly bound, 



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Published March, 1922. 



COAL — Its Properties, Analysis, Classification, 

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By Elwood S. Moore 



Dean of the School of Mines, Pennsylvania State College. 



Gives the salient facts and theories relating to coal — for the practical man, 

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Just Issued. 



THE OIL ENCYCLOPEDIA 



By Marcel Mitzakis, 



Contains detailed particulars, in alphabetical order, of every conceivable 

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