공화국 북반부의 광천 원천 Konghwaguk pukpanbu ŭi kwangch'ŏn wŏnch'ŏn - 김학전 Hak-ch'ŏn Kim (과학원 Chosŏn Minjujuŭi Inmin Konghwaguk Kwahagwŏn, 1957)