HELBRONNER (Paul). Detailed geometrical description of the French Alps. Overview of the summit of Mont Blanc. Appendix to volume two: the iconographic origins of geodesy. S. l., s. n., 1921. One folio volume, leaves, publisher's lace-up portfolio titled on the front cover. Traces of damp and small tears to the plates. 23 large leaves enclosed in six sets, the first of which, entitled Tour d'horizon complet du sommet du Mont Blanc, comprises 13 leaves. In leaves XIV to XXIII, Helbronner has depicted Mont Blanc from the Col du Géant and the summits of the Mont Maudit, the Belvédère des Aiguilles rouges, the Aiguille du Tour and the Aiguille du Moine.