Title: Sŏul Tʻŭkpyŏlsi Chihachʻŏl Kongsa chingnyu chŏnʼgi chʻŏlto e ŭihan chŏnsik chosa pogosŏ
Subjects: Cathodic protection, Electric cables, Electrolytic corrosion, Subways, Underground construction
Places: Korea (South), Seoul