BIBLIOGRAPHY
- Bretz , J. H. 1942 . “Vadose and Phreatic Features of Limestone Caverns” . Journ. Geol. , 50 : 675 – 811 .
- Davis , W. M. 1930 . “Origin of Limestone Caverns” . Bull. Geol. Soc. Amer., vel , 41 : 475 – 628 .
- King , L. C. 1949 . “On the Ages of African Landsurfaces” . Quart. Journ. Geol. Soc. Lond. , 104 : 439 – 459 .
- King , L. C. 1951 . “The Geology of the Makapan and other Caves” . Trans. Roy. Soc. S.A. , 33 : 121 – 151 .
- McIntyre , R. C. 1932 . “The Geology of the Congo Beds” . Trans. Geol. Soc. S.A. , 35 : 69 – 84 .