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  1. 1
    by Haack, Willy
    Published 1934
    Köln, K. Schroeder [1934?]
    147 p. incl. maps, diagrs. fold. map. 22 cm.
  2. 2
    by Bieger, Erhard
    Published 1964
    Köln, Westdeutscher Verlag, 1964.
    138 p. illus. 21 cm.
  3. 3
    by Kluth, Manfred, 1936-
    Published 1969
    [Dusseldorf, M. Triltsch, 1969]
    xi, 73 [i.e. 79] p. 21 cm.
  4. 4
    by Heep, Emil, 1912-
    Published 1936
    Düsseldorf, 1936.
    62 p.
  5. 5
    by Freede, Jochen
    Published 1979
    1979.
    173 S : graph. Darst.
  6. 6
    by Erichsen-Firle, Ursula, 1946-
    Published 1971
    Köln : [s.n.], 1971.
    278 p. : ill. ; 21 cm.
  7. 7
    by Gruppe, Jürgen, 1937-
    Published 1964
    [Köln, 1964]
    xxxvi, 131 p. 21 cm.

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