Lechuguilla : die schönste Höhle der Welt
1991
Widmer, Urs F. |
Speleology
Atlas of the great caves of the world
1989
Courbon, Paul |
Chabert, Claude |
Bosted, Peter |
Lindsley, Karen |
The underground atlas : a gazetteer of the world's cave regions
1987
Middleton, John |
Waltham, Tony |
Speleologie afghane
1975
La Gran Caverna de Santo Tomás : monumento nacional
1990
Núñez Jiménez, Antonio |
Jané, Pablo |
Floresta da Tijuca
1966
Bandeira, Carlos M. |
Martins, Henrique F. |
Coimbra Filho, Adelmar F. |