01015cam a22002531  4500001001300000003000400013005001700017008004100034010001700075035001900092040004000111050001600151051002600167100004900193245007400242260009400316300004500410440002200455500006800477500009700545504003100642650004700673740004100720gs 40000143 DLC20260227111345.0780829s1939    pauab    b   s000 0 eng c  ags 40000143   a(OCoLC)4175448  aU.S. Geol. survey. LibrarycPUdDLC00aTN24.P4bA7  aTN24.P4bS82cCopy 2.1 aStone, Ralph W.q(Ralph Walter),d1876-1964.14aThe minerals of Pennsylvania: Non-metallic minerals,cby R. W. Stone.  aHarrisburg, Pa.,bDepartment of Internal Affairs, Topographic and Geologic Survey,c1939.  a50 p. incl. illus. (map) tables.c23 cm. 0aBulletin M,v18-C  aAt head of title: Pennsylvania Geological survey, Fourth series  aWith Ashley, G. H. The undeveloped mineral resources of Pennsylvania. 1933. (Bulletin M18-A)  aBibliographical footnotes. 0aMines and mineral resourceszPennsylvania.0 aNon-metallic minerals--Pennsylvania.