00621nam a22001931  4500001001300000003000400013005001700017008004100034010001700075040003700092050001900129111007300148245005900221260002600280300005200306504002700358650002500385999001700410gs 50000193 DLC20260227111356.0900309m19501952enkabf   b    100 0 eng c  ags 50000193   aU.S. Geol. Survey Libr./ICUcICU00aQE1b.I6 1948c2 aInternational Geological Congressn(18th :d1948 :cLondon, England)10aReport of the eighteenth session, Great Britain, 1948.  aLondon,c1950-<52   >  av. <1-13, 15   >billus., plates, maps.c25 cm.  aIncludes "References." 0aGeologyxCongresses.  c28484d28484