Everything you need to understand or teach Phoenix in the Ashes by Joan D. Vinge.
As in Psion (1982), the main theme of Phoenix in the Ashes is communication as a means of ending isolation. Hoffmann the helicopter pilot is a loner, tolerated by his employers because he is their best prospector for abandoned cities which can be mined for raw materials such as metal and other minerals. Hoffmann talks to himself both because he does not really like any of his employers and because he spends long hours...