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Primary Crushing

Alva Britt HookerCarlton Ernest BrownEarl Carlton LaneEllis S. HertzogF. G. MillerGeorge Stanley ScottGeorge William JonesHarold Putnam GreenwaldJ. B. LittlefieldLee Clyde IlsleyLudwig SchmidtMark SheppardOliver Caldwell RalstonR. E. HeitheckerW. M. DeatonWilbert James HuffR. G. O'MearaUnited States. Bureau of MinesC. N. WitherowClarence John WilhelmEarl Jeffries CoggeshallErnest J. GleimErnest L. GartonHarry Clarence FowlerHelmuth Herman SchrenkHenry C. HowarthJames R. CudworthRobert E. KennedyW. B. BerwaldGlen Dale CoeHarry Mac CooperHilary Breton Brunot

其他書名	Progress Report No. 1
出版	U.S. Department of the Interior, Bureau of Mines, 1938
URL	http://books.google.com.hk/books?id=iaE9jwEACAAJ&hl=&source=gbs_api