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OF THE

AMERICAN INSTITUTE OF MINING

ENGINEERS

VOL. LVII

CONTAINING PAPERS AND DISCUSSIONS PRESENTED AT
THE NEW YORK MEETING, FEBRUARY, 1917,
AND AT THE ST. LOUIS MEETING,

OCTOBER, 1917.

D LIBRARY

NEW YORK, N. Y.

PUBLISHED BY THE INSTITUTE

AT THE OFFICE OF THE SECRETARY

29 WEST 39TH STREET

1918

ما

541997

COPYRIGHT, 1918, BY THE AMERICAN INSTITUTE OF MINING ENGINEERS

THE MAPLE PRESS YORK PA

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