1. Karst of France;Avias,1972
2. Comparison of chemical hydrogeology of the carbonate peninsulas of Florida and Yucatan;Back;J. Hydrol.,1970
3. Beitrage zur spelaologie des sudchinesichen karstgebietes (The speleology of the karstic region of south China);Balazs;Geomorphol. Abstr.,1964
4. Karst of Austria;Bauer,1972
5. Karst of Italy;Belloni,1972