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Jan 1, 1932

Jan 1, 1947

Jan 1, 1918

Jan 1, 1966

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Jan 1, 1907

Jan 1, 1923

Gypsum Association, 211 West Wacker Drive, Chicago, Ill. Henry J Schweim, Secretary. This trade association issues numerous publications dealing with the utilization and application of gypsum, but the only one which might be of direct interest here is entitled "Gypsum-A Non-

Jan 1, 1933

Jan 1, 1957

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Jan 1, 1907

National Slate Association, Drexel bldg , Philadelphia, Pa. This Association has published a book entitled "Slate Roofs " It is primarily intended for users of slate but it contains some information on the geology, analysis, quarrying and origin of slate It may be had from the office of the Association for $1 50

Jan 1, 1933

Jan 1, 1966

MINERAL INDUSTRY EDUCATION DIVISION Established as a Division January 15, 1932 Harry H. Power, Chairman J R. Van Pelt, Vice-Chairman J. Donald Forrester, Secretary-Treasurer Missouri School of Mines and Metallurgy, Rolla, Mo

Jan 1, 1952

Jan 1, 1966

[Allen-Sherman-Hoff Pump Co. Third Cover Dee Carlton Brown. Advertising Allis-Chalmers Mfg. Co. 110 Compton Advertising, Inc. American Cyanamid Co. * James J. McMahon. Inc. American Manganese Steel Div., American Brake Shoe Co. 138 Fuller & Smith & Ross, Inc.]

Jan 1, 1952

On June 1, the offices of the Engineering Division of the National Research Council were moved from Washington to the sixteenth floor of the Engineering Societies Building, 29 W. 39th St., New York City.

Jan 7, 1919

By William P. Blake

The occurrence of siderite in beds of considerable thickness in the clay formations of Martha's Vineyard, Mass., may have some economical importance, and is at least interesting in a scientific point of view.

Jan 1, 1949

There was such a large demand for copies of the speech of Herbert Hoover at the A. I. M. E. dinner given in his honor on Sept. 16, that a special edition has been run off; anyone desiring copies may obtain them by applying at the office of the Secretary.

Jan 12, 1919