National geographic

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  Año 1940, Vol. 78, Número 6

  • Aviation in commerce and defense

    F. Barrows Colton

    págs. 685-726

    

  • In the realms of the Maharajas

    Lawrence Copley Thaw, Margaret S. Thaw

    págs. 727-780

    

  • Canoeing down the river Jordan

    John D. Whiting

    págs. 781-808

    

  • Old-new battle grounds of Egypt and Libia

    W. Robert Moore

    págs. 809-820

    

  • New United States map shows census changes

    págs. 821-824