Actes Du Premier Symposium International Sur La Protection Du Patrimoine Geologique:
Digne-Les-Bains, 11-16 Juin 1991 = Proceedings of the 1st International Symposium on the Conservation of Our Geological Heritage Digne-Les-Bains, 11-16 June 1991

by Jean-Simon Pages, European Working Group on Earth Science Conservation, Conference permanente des reserves naturelles