As far as we know, the first detailed maps of Tocantins were topographical maps scale 1:100000, based on photography and produced in the seventees by the Brazilian army. These maps each cover a region of about 50km x 50km. The particular map of the area where Palmas was to be constructed, will be very hard to find because the planners used them to draw on.
Early maps, as the French map of 1860 shown below, show that Tocantins until recently was quite unknown and undocumented. It was only in the ninetees that the area was geographically studied. The Seplan put together the Tocantins Atlas, a book of 50 pages showing the current situation and the potentials.