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1Published 1923### CRL customization ### ?> ### Add publisher and desc details ### ?>Washington, D.C. American Mining Congresses, 1923.387 p. 1 illus., diagrs. 23 cm.
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2Published 1924### CRL customization ### ?> ### Add publisher and desc details ### ?>Washington, D.C., American Mining Congress, 1924.328 p. illus., diagrs. 23 cm.