Ore deposits of the Coeur d'Alene district Shoshone County, Idaho /

Autor Fryklund, V. C. Jr., 1920-2014
Vydáno 1964

Niobium (columbium) and titanium at Magnet Cove and Potash Sulphur Springe, Arkansas : a contribution to economic geology /

Autor Fryklund, V. C. Jr., 1920-2014, Harner, R. S., Kaiser, E. P. 1912-2001
Vydáno 1954