Hwahak ŭi kijŏk
Subtitle: hwahak kongjangdŭlŭl chʻajasŏ
By: Chʻa Pyŏng-chʻŏl, Yu Sŏng-hŭi, Ma Hyŏng-ok ; [pʻyŏnjip An Chŏng-sil].
Publisher: Adong Tosŏ Chʻulpʻansa
Published: 1960
Place of publication: Pʻyŏngyang
Language: kor
Number of pages: 199