Euskara: Ramon Adan de Yarza (Bilbo, 1848ko ekainaren 5a – Arrasate, 1917ko urtarrilaren 25a),[1] ikertzaile askoren iritziz, Euskal Herrian inoiz izan den geologorik garrantzitsuena da. Mundu mailan ere, XIX gizaldiko petrografo ospetsuenetakoa izan zen, eta espeleologia zientifikoaren aitzindarietako bat.
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