National geographic

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  Año 1972, Vol. 141, Número 4

  • Winter caravan to the roof of the world

    Sabrina Michaud, Roland Michaud

    págs. 435-465

    

  • Springtime of hope in Poland

    Peter T. White

    págs. 467-500

    

  • Getting to know the wild burros of death valley

    Patricia D. Moehlman

    págs. 502-517

    

  • We're doing something about the weather!

    Walter Orr Roberts

    págs. 518-555

    

  • Easter greetings from the ukrainians

    Robert Paul Jordan

    págs. 556-563

    

  • Diving with sea snakes

    Kenneth MacLeish

    págs. 565-578