Ore Deposits: Origin, Exploration, and Exploitation
Mixed-Media Paint Box: Weekly Projects for a Year of Creative Exploration
Mars : past, present, and future; technical papers selected from the Mars Exploration Past, Present and Future Conference, Williamsburg, Virginia, July 1991
Schizophrenia: The Positive Perspective: Explorations at the Outer Reaches of Human Experience
Geography, Technology and Instruments of Exploration