Vorträge über Deszendenztheorie : gehalten an der Universität zu Freiburg im Breisgau.
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Vorträge über Deszendenztheorie : gehalten an der Universität zu Freiburg im Breisgau. Credit: This material has been provided by the Gerstein Science Information Centre at the University of Toronto, through the Medical Heritage Library. The original may be consulted at the Gerstein Science Information Centre, University of Toronto.. Public Domain Mark