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  1. 1
    by Bürgi, Paul, 1921-
    Published 1948
    Switzerland : Universität Zürich, 1948.
    160 p. illus. 21 cm.
  2. 2
    by Nelson, Disa K.
    Published 1987
    Bern : P. Haupt, c1987.
    455 p. : ill. ; 23 cm.
  3. 3
  4. 4

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