Geofisica pura e applicataApril 1951, Volume 19, Issue 3–4, pp 232–236 | Cite asLibri nuoviArticle 14 Downloads This is a preview of subscription content, log in to check access.PreviewUnable to display preview. Download preview PDF.Unable to display preview. Download preview PDF.Copyright information© Istituto Geofisico Italiano 1951