Low Cost Micro-Spectrometer for Resource Mapping on Mars
A glimpse at Kootenay and its wonders
Thunder mountain region, Idaho county, Idaho
Metallogeny in Russia's drive for ore deposits
Greece General Inspection of Mines -- Bulletin of Mining Activities of Greece
Aleutian Seismic Program, Seismological Bulletin, October 1970
Feasibility Study of Alternative Fuels for Automotive Transportation
Aleutian Seismic Program. Seismological Bulletin, May 1970