Hi, I am very keen to buy one of the blooks listed below as a gift for a caver:
Le gouffre et la rivi?re souterraine de Padirac (in French), Paris: Delagrave, 1901, 180 p.
La sp?l?ologie aux XXe si?cle (in French), Paris: Hermann, 1905, 810 p.
Les cavernes et les rivi?res souterraines de la...