National geographic

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  Año 1958, Vol. 114, Número 2

  • British Columbia: life begins at 100

    David S. Boyer

    págs. 147-187

    

  • Dogs work for man

    Edward J. Linehan

    págs. 190-233

    

  • How old is it?: telletale radioactivity in every living thing is cracking the riddle of age

    Lyman J. Briggs, Kenneth F. Weaver

    págs. 234-255

    

  • Off Santa Barbara: California's ranches in the sea

    Earl Warren

    págs. 257-283

    

  • Paris, vibrant heart of France

    págs. 285-302