Hwahak so sajŏn
By: Kwahagwŏn Hwahak Yŏnʼguso pʻyŏnchʻan, Sujŏng chaepʻyŏn
Publisher: Kwahagwŏn Chʻulpʻansa
Published: 1955
Place of publication: Pʻyŏngyang
Language: kor
Number of pages: 886
Notes: Preserved, Deacidified, 2012 Cranberry, PA Preservation Technologies LP