Dr. L. B. Slichter of the Physical Exploration Corporation will deliver a series of five lectures next week on geophysical methods employed in prospecting for metallic ores. The lectures are given as ...
Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results