The conquest of the caves and underground rivers of Czechoslovakia's Macocha abyss

ABSOLON, Karel. The conquest of the caves and underground rivers of Czechoslovakia's Macocha abyss : a historical and technical study of their exploration. 2nd ed. Rockville : Kabel, 1988. xiii, 103 s., [4] s. obrazové přílohy. ISBN 0-930329-30-9.