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  1. 1
    by Engelen, G. B.
    Published 1963
    Eindhoven : Drukkerij de wereld, 1963.
    92 p. : ill. ; 29 cm.
  2. 2
    by Haan, Julius Albert den, 1946-
    Published 1979
    Utrecht : Geologisch Instituut der Rijksuniversiteit te Utrecht, [1979?]
    116 p. : ill. ; 25 cm.
  3. 3
    Utrecht, N. v. A. Oosthoek's uitgevers-maatij., 1935.
    4 p. l., 72 p. illus., fold. map. 30 x 23 cm.
  4. 4
    by Heim, Robert Clemens
    Published 1952
    Utrecht, 1952.
    66 p. illus., diagrs. maps (4 in pocket) 30 cm.

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