https://www.catastogrotte.net/liguria/it/bibliography/view/253/?nv_year=2002&page=1&nv_zone=SV24&nv_province=SV
Gestionale Speleologico Ligure - Ancora il Buranco della Urpe
gestionaleligureancoraildella
https://www.openspeleo.org/openspeleo/index.php?mod=caves&page=6&viewmode=list&nv_zone=267&op=view&id=292
Openspeleo - Buranco da Urpe
daurpe
https://braveneweurope.com/tag/urpe
URPE Archives - Brave New Europe
new europeurpearchivesbrave