01166cam a22002651  4500001001300000003000400013005001700017008004100034010001700075035001900092040003100111042001200142050002200154082001000176086001700186100002800203245029800231260004800529300009600577410005600673504003000729650003900759650005300798740004900851gs 59000160 DLC20260227111408.0780715s1959    dcuabd   b   f000 0 eng    ags 59000160   a(OCoLC)4055613  aDLCcOClUdISSdOCoLCdDLC  apremarc00aQE75b.P9 no. 309  a557.70 aI 19.16:309/1 aHeyl, Allen Van,d1918-04aThe geology of the upper Mississippi Valley zinc-lead distict,cby Allen V. Heyl, Jr. [and others]  With special sections by Arthur E. Flint. Prepared in cooperation with the Wisconsin Geological and Natural History Survey, the Iowa Geological Survey, and the Illinois State Geological Survey.  aWashington,bU.S. Govt. Print. Off.,c1959.  ax, 310 p.billus., maps (24 fold. 22 col., in portfolio) diagrs., profiles, tables.c29 cm.20aGeological Survey (U.S.).tProfessional paper,v309  aBibliography: p. 296-303. 0aGeologyzMississippi River Valley. 0aZinc mines and miningzMississippi River Valley.0 aUpper Mississippi Valley zinc-lead district.