@inproceedings{inproceedings9ede47db,
title   = {Ecological alteration of the brazilian northwest region due to intensive colonization ; a biogeochemical study},
author = {Mortatti, Jefferson and Ferreira, J. R. and Martinelli, Luiz Antonio and Victoria, R L},
year = {1988},
publisher = {Unesp-Faculdade de Ciencias Agronomicas},
booktitle   = {International Congress of Americanists}
}