Polardata.ch
| Title | Authors | Year |
|---|---|---|
| How John Haller Worked during his Winter of 1949/1950. In: Schwarzenbach, F.H. (edit.): Towards New Horizons: John Haller 1927-1984, pp. 44-49, Zürich, Verlag der Fachvereine Zürich oder Schweizerische Stiftung für Alpine Forschungen, Zürich. | Witzig, Emil | 1993 |
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