1. The Case for Mars IV : the international exploration of Mars--mission strategy and architectures : proceedings of the fourth Case for Mars Conference held June 4-8, 1990, at the University of Colorado, Boulder, Colorado Author/Creator: Case for Mars Conference University of Colorado) 1990 : (4th Publication/Creation: San Diego, Calif. : Published for the American Astronautical Society by Univelt, [1997] Format: Book Access & Availability: Loading
2. The Case for Mars IV : the international exploration of Mars--consideration for sending humans : proceedings of the fourth Case for Mars Conference held June 4-8, 1990, at the University of Colorado, Boulder, Colorado Author/Creator: Case for Mars Conference University of Colorado) 1990 : (4th Publication/Creation: San Diego, Calif. : Published for the American Astronautical Society by Univelt, [1997] Format: Book Access & Availability: Loading