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http://www.mountcity.it/index.php/2014/12/06/scalate-estreme-appesi-come-pipistrelli-nel-buco-del-piombo-i-ragni-della-grignetta-replicano-in-brianza-unimpresa-di-mezzo-secolo-prima/
Appesi come pipistrelli nel Buco del Piombo