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  1. Compressor at La Dificultad mine, Pachuca, Hidalgo

    • Collection: José Villegas Collection on Mining
    • Name: Compañía Real del Monte y Pachuca
    • Date: between 1895 and 1983
    • Topic: Mining machinery
    • Format: image
  2. Hacienda de Beneficio Loreto, Pachuca, Hidalgo

    • Collection: José Villegas Collection on Mining
    • Name: Compañía Real del Monte y Pachuca
    • Date: between 1895 and 1983
    • Topic: Silver mines and mining
    • Format: image
  3. La Dificultad mine steam engine house chimney, Pachuca, Hidalgo

    • Collection: José Villegas Collection on Mining
    • Name: Compañía Real del Monte y Pachuca
    • Date: between 1895 and 1983
    • Topic: Silver mines and mining
    • Format: image
  4. La Dificultad mine steam engine house, Pachuca, Hidalgo

    • Collection: José Villegas Collection on Mining
    • Name: Compañía Real del Monte y Pachuca
    • Date: between 1895 and 1983
    • Topic: Silver mines and mining
    • Format: image
  5. Casa de la máquina de vapor y chimenea Real del Monte

    • Collection: José Villegas Collection on Mining
    • Name: Compañía Real del Monte y Pachuca
    • Date: between 1895 and 1983
    • Topic: Silver mines and mining
    • Format: image
  6. Biology "Immunity II." (Chicago)

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  7. Biology 1 (Chicago). Includes draft of "Science is my racket" and "Chemostat"

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  8. Biology 7

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  9. Notebook 3

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  10. Patents - Liquid/Liquid extractor

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  11. Physics "Uranium"

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  12. Physics (G-22)

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  13. "Reminiscences" Excerpts 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  14. [Biology (G-31)]

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  15. [Biology (K-12)]

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  16. Aging

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  17. Aging (S-48) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  18. American Arbitration Association

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  19. Amino Acid Charts

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  20. Angels Project

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  21. Antibody letters (V-83) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  22. Atomic Energy Control Conference

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  23. Bethe Chicago (G-29)

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  24. Bibliographic materials 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  25. Biographical publications

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  26. Biographical References for Extension of Leo Szilard Biography 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  27. Biology "DNA" 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  28. Biology (Aging G-27) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  29. Biology (B-1) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  30. Biology (E-11) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  31. Biology (E-52) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  32. Biology (R-26) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  33. Biology 4 (Chicago)

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo
    • Date: between 1898 and 1998
    • Format: text
  34. Biology Algae (E-33) 

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  35. Bullsperm - Photographs

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  36. Bund

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  37. C- miscellaneous - Correspondence - part 1

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo -- correspondence
    • Date: between 1898 and 1998
    • Format: text
  38. Canfield, Cass

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  39. Central Nervous System

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  40. Cold Springs Harbor Symposium

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  41. Collected Works of Leo Szilard: Notes - 1

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  42. Collected Works of Leo Szilard: Notes - 2

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  43. Collected Works of Leo Szilard: Notes - 4

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  44. Collected Works of Leo Szilard: Notes - 5

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  45. Congress International de Physique Nucleaire

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  46. Coronary Heart Disease

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  47. Council and the Lobby

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  48. Council to Abolish War - Correspondence of public response

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  49. Council to Abolish War - General materials

    • Collection: Leo Szilard Papers
    • Date: between 1898 and 1998
    • Format: text
  50. Council, MIT 

    • Collection: Leo Szilard Papers
    • Name: Szilard, Leo -- Oratory
    • Date: between 1898 and 1998
    • Format: text