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  1. 1
    Rural ventilated improved pit latrines : a field manual for Botswana

    Rural ventilated improved pit latrines : a field manual for Botswana 由 Van Nostrand, John

    出版 1983
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  2. 2
    The ventiled improved double-pit latrine : a construction manual for Botswana

    The ventiled improved double-pit latrine : a construction manual for Botswana 由 Van Nostrand, John

    出版 1983
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