TY  - RPRT
TI  - Niobium (columbium) and titanium at Magnet Cove and Potash Sulphur Springs, Arkansas
AU  - Verne Charles Fryklund
AU  - R. S. Harner
AU  - E.P. Kaiser
PY  - 1954
DO  - 10.3133/b1015b
UR  - https://pubs.usgs.gov/publication/b1015B
ID  - b1015B
ER  -