Molybdenite from South Hamgyong Province, North Korea
North Korea | |
| Hideo Tsuda: "Supplement to "Minerals of Korea"" (in: Geology and Mineral Resources of the Far East, University of Tokyo Press, 1969) |
| (1998) International strategic mineral issues summary report: tungsten. Circular 930-O. US Geological Survey doi:10.3133/cir930o |
| Nakamura, K. (1943) Journal of the Geographical Society, Tokyo, 55, 652. |