File:1987 Census of Mineral Industries. Preliminary Report. Industry Series. Clay, Ceramic, and Refractory Minerals (IA 1987censusofm87114unse).pdf
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![File:1987 Census of Mineral Industries. Preliminary Report. Industry Series. Clay, Ceramic, and Refractory Minerals (IA 1987censusofm87114unse).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/1987_Census_of_Mineral_Industries._Preliminary_Report._Industry_Series._Clay%2C_Ceramic%2C_and_Refractory_Minerals_%28IA_1987censusofm87114unse%29.pdf/page1-427px-1987_Census_of_Mineral_Industries._Preliminary_Report._Industry_Series._Clay%2C_Ceramic%2C_and_Refractory_Minerals_%28IA_1987censusofm87114unse%29.pdf.jpg?20200620015004)
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