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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