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  1. 1
    by Boonen, Michael
    Published 1979
    1979.
    75 S.
  2. 2
    by Müller, Werner
    Published 1930
    Bonn : Hch. Ludwig, Spezialdruckerei für Dissertationen, 1930.
    viii, 93 p. : ill., maps ; 25 cm.
  3. 3
    by Korff, Ursula
    Published 1980
    1980.
    82 S : graph. Darst.
  4. 4
  5. 5
  6. 6
    by Knispel, Angelika
    Published 1981
    Germany : Universität Bonn, 1981.
    72 S.
  7. 7
  8. 8
    by Wyckoff, Theodore
    Published 1968
    Bonn, 1968.
    307 p. ports. 21 cm.
  9. 9
    by Kunert, Rainer
    Published 1982
    1982.
    151 S : ill., graph. Darst.

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