Il vibrografo Alfani (un nuovo tipo di strumenti sismici). Nota I - Il vibrografo accelerometrico Alfani . Nota II. Pubblicazioni dell`Osservatorio Ximeniano di Firenze n° 146-147. Estratti dal Bollettino del Comitato per la Geodesia e la Geofisica del C.N.R. anni 1934-1935. 2 opuscoli in bross. di pp. 8, 12 con alcune ill. Buon es.

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