Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 1019
areworth almost |17:..000, and in 1910 .<unif .ts.iMMj ton.< were worth |:;iC,mmO.The value, however, has in the lastfew years kept well above |5 a ton. Gypsum occurs most commonly asrock gypsum, although it is foundchrystalline as selenite. Gypsum is used in the form of plas-ter of Paris. It… … (lay Iroducta. This diagram includes all clays useoin the manufacture of red and brownearthenware, flower pots, tiling of allkinds, building terra cotta, sewerpipe, etc., and figures for value andamount relate to the crude material atthe pit. The diagram shows that the fat andthe lean years in this…
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