1. A photometric technique for determining planetary slopes from orbital photographs Author/Creator: Bonner, W. J., author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1973 Resource Type: Book Access & Availability: Loading
2. Physical properties of the surface materials at the Viking landing sites on Mars Author/Creator: Moore, H. J. 1928- (Henry J.), author Publication/Creation: Washington : Department of the Interior, U.S. Geological Survey, 19. Resource Type: Book Access & Availability: Loading