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Mém. Soc. Phys. Genève, Suppl. (Volume supplémentaire): t. 2, fig. 33-37 () [H. Feer] []
drawing: H. Feer [7]
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Mém. Soc. Phys. Genève, Suppl. (Volume supplémentaire): t. 2, fig. 33-37 () [H. Feer]
