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  1. 61
    Los recursos naturales de Mexico.
    by Beltrán, Enrique, 1903-1994
    Published 1955
    Book
  2. 62
    Natural principles of land use /
    by Graham, Edward Harrison, 1902-
    Published 1944
    Book
  3. 63
    The Delta looks forward : an inventory of natural and human resources.
    by Highsaw, Robert Baker, 1917-
    Published 1949
    Book
  4. 64
    The Nation looks at its resources ; report of the Mid-century Conference on Resources for the Future, Washington, D.C., December 2, 3, 4, 1953.
    Published 1954
    Conference Proceeding Book
  5. 65
    International resources and national policy /
    by Mouzon, Olin T.
    Published 1959
    Book
  6. 66
    My country 'tis of thee : the use and abuse of natural resources /
    Book
  7. 67
    Resources and the American dream : including a theory of the limit of growth.
    by Ordway, Samuel Hanson, 1900-
    Published 1953
    Book
  8. 68
    Our natural resources and their conservation /
    Book
  9. 69
    Our economic world ; a study of the world's natural resources and industries /
    by Kinsman, Delos Oscar, 1868-
    Published 1937
    Book
  10. 70
    Tomorrow's birthright ; a political and economic interpretation of our natural resources.
    by Lyons, Barrow
    Published 1955
    Book
  11. 71
    Guia para la conservacion de la naturaleza.
    Book
  12. 72
    Why not survive?
    by Straus, Michael W.
    Published 1955
    Book
  13. 73
    Japanese natural resources ; a comprehensive survey. [Prepared in General Headquarters in 1948.
    Published 1949
    Book
  14. 74
    Natural resources and economic growth /
    Conference Proceeding Book
  15. 75
    Our natural resources and their conservation /
    Book
  16. 76
    Teaching conservation : a guide in natural resources education.
    by Beard, Ward Powers, 1892-
    Published 1948
    Book
  17. 77
    Los recursos naturales de Mexico y nuestra economia.
    by Beltrán, Enrique, 1903-1994
    Published 1954
    Book
  18. 78
    El sureste e sus recursos naturales.
    by Beltrán, Enrique, 1903-1994
    Published 1954
    Book
  19. 79
    The basis of Soviet strength /
    Book
  20. 80
    America's treasure /
    Book
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