Bismuth from North Korea
North Korea | |
| watanabe, T. : Boron mineral resources in Korea (in: Geology and Mineral Resources of the Far East, University of Tokyo Press, 1969) |
Resource Geology, vol. 50, no. 4, 213-228, 2000 | |
| Ishibashi, M. (1944) Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 31, 5. |