Guidelines for cave and karst protection. Prepared by the WCPA Working Group on Cave and Karst Protection Guidelines for cave and karst protection. Prepared by the WCPA Working Group on Cave and Karst Protection

por 130719 Watson, J., 75807 Hamilton Smith, E., 71791 Gillieson, D., 82983 Kiernan, K. eds., 13013 IUCN, Gland (Suiza)
Publicado em 1997