@article{machado_1973,  title={O uso do solo na Amazônia},  volume={3},  ISSN={0044-5967},  url={https://doi.org/10.1590/1809-43921973031003},  DOI={10.1590/1809-43921973031003},  number={1},  journal={Acta Amazonica},  publisher={Instituto Nacional de Pesquisas da Amazônia},  author={Machado, P. Almeida},  year={1973},  month={Apr},  pages={3–4} }