Caves and cave diving / by Guy de Lavaur, President of the Speleo-Club of Paris, General Secretary of the National Committee of Speleology ; translated by Edmund J. Mason from the French "Toute la spéléologie."
Potholes and underground rivers. The birth of a vocation ; Pothole exploring ; Exploring underground rivers ; Equipment for underground exploration -- Sumps and Vauclusian springs. Exploration ; Aspects of underground diving ; The possibilities of self-contained diving equipment -- The evolution of speleology. The development of techniques and rising standards of cave exploration ; The uses of underground exploration.