Digital processing and geological interpretation of TM-Landsat images of the area east of the Camaquã mine in Rio Grande do Sul, state, southern Brazil - Almeida, Teodoro Isnard Ribeiro de; Silva Filho, Wellington; Fambrini, Gelson Luís; Sayeg, Heitor Siqueira; McReath, Ian; Machado, Rômulo; Fragoso Cesar, Antonio Romalino Santos (Boletim IG-USP. Série Científica, 1997)