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Issel A. 1901. Le rupi scolpite nelle alte valli delle Alpi Marittime, Bullettino di paletnologia italiana, s. III, t. VII, a. XXVII, n. 10-12, pp. 218-259.
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[editor’s note: the most detailed paper until that time on Mt. Bego’s engravings; Issel never recorded the engraved rocks, but attentively examined the literature and was in close and friendly contact with C. Bicknell]
by Arturo ISSEL