Un demi-siècle (1907-1956) de notes, communiquées aux académies de Paris, d'Amsterdam, des Lincei, suivies par des observations et commentaries.
Reproduites avec le concours du Centre national de la recherche scientifique.

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Limited (search only)   v.1 University of California
Limited (search only)   v.1 University of Michigan
Limited (search only)   t.1 Pennsylvania State University
Limited (search only)   v.2 University of California
Limited (search only)   v.2 University of Michigan
Limited (search only)   t.2 Pennsylvania State University