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  1. By: Nichols, Henry W. (Henry Windsor), - Field Museum of Natural History. Dept. of Geology
    Publication info: Chicago:Field Museum of Natural History,1922.
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Arizona  Geological modeling  Gold mines and mining  Goudmijnen  Modellen  
  2. By: Nichols, Henry W. (Henry Windsor),
    Publication info: Chicago:Field Museum of Natural History,1922.
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Blast furnaces  Geological modeling  Hoogovens  Iron  Metallurgy  Modellen  Smelting