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Edited by the Secretary, under the direction of the Committee on Publications.
Reprints from this publication, which is copyrighted, may be made on condition that
the full title of Paper, name of Author, page reference, and date
of presentation to the Society, are given.
Entered according to Act of Congress, in the year 1919, by the AMERICAN SOCIETY OF
CIVIL ENGINEERS, in the office of the Librarian of Congress, at Washington,