1. Agricola, G.De Re Metallica; Dover Publications: New York, 1950; pp 354−355.
2. Quarterly Bulletin of Statistics; Food and Agriculture Organization of the United Nations, 1992; Vol. 5 (4). Surprisingly, the Associacao Brasileira de Carvao Vegetal3estimates Brazilian production during 1989 to be about 9.3 million tonnes. Such gross disagreements in estimates of regional charcoal production are not uncommon and point to the difficulty in assessing the role of this renewable commodity in national economies.
3. Statistical Yearbook; Associacao Brasileira de Carvao Vegetal, Brazil, 1990.
4. Handbook of Charcoal Making
5. Foley, G.Earthscan Technical Report No. 5; International Institute for Environment and Development; Russell Press: Nottingham, U.K., 1986.