00289nam a2200109Ia 4500008004100000041000800041084001000049100001800059245004300077260003800120653002100158160808s1947    xx            000 0 eng d  aeng  aA2CC  aSummer, W. L.  aProgress in science /cby W. L. Summer  aOxford :bBasil Blackwell,c1947.  aNatural Sciences