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  1. 1
    by Jürging, Hans-Rudolf
    Published 1975
    [Düsseldorf] : Landesausschuss für Landwirtschaftliche Forschung, Erziehung und Wirtschaftsberatung beim Ministerium für Ernährung, Landwirtschaft und Forsten des Landes Nordrhein-Westfalen, 1975.
    198 p. : graphs, maps ; 21 cm.
  2. 2
    by Frentz, Therese
    Published 1991
    [Bonn : s.n.], 1991.
    li, 333 p. : ill., maps ; 21 cm.
  3. 3
    by Born, Dietrich
    Published 1969
    Hannover, A. Strothe, 1969.
    278 p. illus., 21 cm.
  4. 4
  5. 5
    Bonn, 1961.
    342 p. illus. 21 cm.
  6. 6
    by Helms, Ekkehart
    Published 1971
    1971.
    321 p. : ill. ; 21 cm.
  7. 7
    by Doerr, Rainer, 1929-
    Published 1968
    [N.p., 1968?]
    xii, 437 p. ; 21 cm.
  8. 8
  9. 9
    by Hahr, G. A.
    Published 1974
    Hiltrup (Westf.) : Landwirtschaftsverlag, 1974.
    89 p. in various pagings : ill., 2 fold maps ; 30 cm.
  10. 10
    by Engemann, Corinna
    Published 1992
    s.n.], [Germany : 1992.
    241 p. : ill., maps ; 21 cm.

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