1. Pliny, ‘Naturalis Historiae, Liber 36–37’, (English translation of Books 36–37 by D. E. Eichholz, Cambridge, Mass., in the Loeb Classical Library, Harvard University Press, First published 1962).
2. Vitruvius, ‘Ten Books on Architecture (Di architectura libri decem)’ [in Latin], (English translations by M. M. Morgan, Cambridge, Mass., 1914, and by F. Granger in the Loeb Classical Library, 2 Vols.).
3. Winkler, E.M., ‘Stone in Architecture: Properties, Durability’, 3rd Edition. (Springer-Verlag. Berlin Heidelberg, 1997).
4. Hughes, R.J., ‘Kemper County geology’,Mississippi State Geological Survey Bulletin 84 (1958) 274.
5. Park, C.C., ‘Acid rain, rheotoric and reality’ (Methuen, New York, 1978).