Comparison of Astronomy Textbooks During the Period of Korean Empire Bahk, Uhn Mee ; Mihn, Byeong-Hee ; Lee, Yong Sam Abstract Publication: Publication of Korean Astronomical Society Pub Date: September 2016 DOI: 10.5303/PKAS.2016.31.2.021 Bibcode: 2016PKAS...31...21B