1. 1
   Proceedings of the third National Standardization Conference, held in connection with the twenty-fifth annual convention of the American Mining Congress, Cleveland, Ohio, October 9-14, 1922

   Published 1923

   Washington, D.C. American Mining Congresses, 1923.

   387 p. 1 illus., diagrs. 23 cm.

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2. 2
   Proceedings of the fourth National Standardization Conference, held in connection with the twenty-sixth annual convention of the American Mining Congress, Milwaukee, Wis., September 24-29, 1923

   Published 1924

   Washington, D.C., American Mining Congress, 1924.

   328 p. illus., diagrs. 23 cm.

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