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  1. 1
    by Sturesson, Ulf
    Published 1988
    Stockholm, Sweden : Distributor, Almqvist & Wiksell International, 1988.
    17 p. : ill. ; 21 cm.
  2. 2
    by Rodhe, Agnes
    Published 1987
    Uppsala : Sveriges geologiska undersökning, 1987.
    80 p. : ill., maps ; 30 cm.

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