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  1. 1
    Aerial photo-interpretation for soil erosion and conservation survey part II: erosion factors

    Aerial photo-interpretation for soil erosion and conservation survey part II: erosion factors af BERGSMA, E.

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  2. 2
    Aerial photo-interpretation for soil erosion and conservation survey part I: soil erosion features

    Aerial photo-interpretation for soil erosion and conservation survey part I: soil erosion features af BERGSMA, E.

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