Clays and Clay Industries of Pennsylvannia: I. Clays of Western Pennsylvania (in Part). Description of the Clays and Clay Industries in the Ohio, Monongahela, Youghiogheny and Conemaugh River Valleys in Pennsylvania, and the Allegheny Valley as Far Up as Kittanning, Including Allegheny, Westmoreland and Fayette Counties and Parts of Beaver, Washington, Greene, Indiana, Armstrong and Cambria Counties

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W.S. Ray, state printer, 1897 - Bricks - 183 pages
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