Institute of Geology, State Academy of Sciences, DPR of Korea ; [edited by Paek Ryong Jun, Kang Hyong Gap, Jon Guk Pu, translated Korean into English]Foreign Languages Books Pub. House1996
Geological institute academy of sciences, DPR of Korea ; edited by Paek Ryong Jun, Kang Hyong Gap, Jon Guk Pu, Kim Yong Muk, Kim Yong HyonForeign Languages Books Publishing House1993