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  1. 1
    Leiden, "De Sleutelstad" [1948]
    131 p. illus., map. 25 cm.
  2. 2
    by Biermann, Cornelis, 1946-
    Published 1979
    [Leiden? : s.n., 1979?]
    121 p. : ill. ; 24 cm.
  3. 3
    Stockholm : Sveriges geologiska undersökning : distribution Svenska Reproduktions, 1973.
    115 p. : ill., maps (4 folded in pocket) ; 25 cm.
  4. 4
    by Heybroek, Pierre
    Published 1950
    Leiden [1950]
    57-195 p. illus., maps (2 fold., incl. 1 col., in pocket) 27 cm.

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