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Slate deposits and slate industry of the United States /

By Dale, T. Nelson.
Washington, Govt. Print. Off., 1906 .
154, iii p. : , Subject series : A, Economic geology, 63. | Issued also as House doc. no. 469, 59th Cong., 1st sess. | "Bibliography of slate" : p. 138-145. | Includes index. 24 cm..

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Slate in the United States,

By Dale, T. Nelson.
Washington, Govt. print. off., 1914 .
220 p. , Many plates printed on both sides of leaves. | "The present bulletin is not only a corrected and revised ed. of bulletin 275, but contains also the results of ... recent discoveries and studies." 24 cm..

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