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  1. 61
    Proceedings of the second Pan American scientific congress : contribución al análisis toxicológico del mercurio /

    Proceedings of the second Pan American scientific congress : contribución al análisis toxicológico del mercurio / by Renson, Carlos

    Article
  2. 62
    Proceedings of the second Pan American scientific congress : metallurgy of tin ores in Bolivia /

    Proceedings of the second Pan American scientific congress : metallurgy of tin ores in Bolivia / by Hollister, Scoville E.

    Article
  3. 63
    Proceedings of the second Pan American scientific congress : Bolivian tin and its relation to the United States /

    Proceedings of the second Pan American scientific congress : Bolivian tin and its relation to the United States / by Bancroft, Howland

    Article
  4. 64
    Proceedings of the second Pan American scientific congress : coal fields of the United States considered as sources of supply for the western hemisphere /

    Proceedings of the second Pan American scientific congress : coal fields of the United States considered as sources of supply for the western hemisphere / by Campbell, Marius R.

    Article
  5. 65
    Proceedings of the second Pan American scientific congress : the occurrence and preparation of radium and associated metals /

    Proceedings of the second Pan American scientific congress : the occurrence and preparation of radium and associated metals / by Parsons, Charles L.

    Article
  6. 66
    Proceedings of the second Pan American scientific congress : geologia general y económica de Colombia /

    Proceedings of the second Pan American scientific congress : geologia general y económica de Colombia / by Ospina, Tulio

    Article
  7. 67
    Proceedings of the second Pan American scientific congress : the cement industry and its future development /

    Proceedings of the second Pan American scientific congress : the cement industry and its future development / by Eckel, Edwin C.

    Article
  8. 68
    Proceedings of the second Pan American scientific congress : reseña geológica del departamento de Cundinamarca, cordillera oriental de los Andes colombianos /

    Proceedings of the second Pan American scientific congress : reseña geológica del departamento de Cundinamarca, cordillera oriental de los Andes colombianos / by Lleras Codazzi, Ricardo

    Article
  9. 69
    Proceedings of the second Pan American scientific congress : geología general de la República de El Salvador, en lo que se relaciona con la minería /

    Proceedings of the second Pan American scientific congress : geología general de la República de El Salvador, en lo que se relaciona con la minería / by Fleury, Luis

    Article
  10. 70
    Proceedings of the second Pan American scientific congress : rubbler /

    Proceedings of the second Pan American scientific congress : rubbler / by Walker, Percy H.

    Article
  11. 71
    Proceedings of the second Pan American scientific congress : chemical research as a directing aid in the efficient utilization of pine forests /

    Proceedings of the second Pan American scientific congress : chemical research as a directing aid in the efficient utilization of pine forests / by Herty, Charles H.

    Article
  12. 72
    Proceedings of the second Pan American scientific congress : mining costs and selling prices of coal in the United States and Europe, with special reference to export trade /

    Proceedings of the second Pan American scientific congress : mining costs and selling prices of coal in the United States and Europe, with special reference to export trade / by Rice, George S.

    Article
  13. 73
    Proceedings of the second Pan American scientific congress : cooper in America /

    Proceedings of the second Pan American scientific congress : cooper in America / by Weed, Walter Harvey

    Article
  14. 74
    Proceedings of the second Pan American scientific congress : mineralogía, metalurgia y geología económica /

    Proceedings of the second Pan American scientific congress : mineralogía, metalurgia y geología económica / by Fleury, Luis

    Article
  15. 75
    Proceedings of the second Pan American scientific congress : the hydrometallurgical treatment of complex gold and silver ores /

    Proceedings of the second Pan American scientific congress : the hydrometallurgical treatment of complex gold and silver ores / by Clevenger, G. H.

    Article
  16. 76
    Proceedings of the second Pan American scientific congress : the field for cyaniding in South America /

    Proceedings of the second Pan American scientific congress : the field for cyaniding in South America / by Megraw, Herbert A.

    Article
  17. 77
    Proceedings of the second Pan American scientific congress : metalurgy of native silver ores of southwestern Chihuahua /

    Proceedings of the second Pan American scientific congress : metalurgy of native silver ores of southwestern Chihuahua / by Brodie, W. M.

    Article
  18. 78
    Proceedings of the second Pan American scientific congress : estudio sobre concentración y metalurgia, concretado al mineral de San Antonio de Oriente /

    Proceedings of the second Pan American scientific congress : estudio sobre concentración y metalurgia, concretado al mineral de San Antonio de Oriente / by Callejas, Juan Miguel

    Article
  19. 79
    Proceedings of the second Pan American scientific congress : concentración por flotación /

    Proceedings of the second Pan American scientific congress : concentración por flotación / by Fuchs, Federico G.

    Article
  20. 80
    Proceedings of the second Pan American scientific congress : the United States Bureau of Mines /

    Proceedings of the second Pan American scientific congress : the United States Bureau of Mines / by Manning, H.

    Article

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