Nodong saengsan nŭngnyul ŭi pudangan changsŏng ŭi pŏpch'ik
By: Yi Pyŏng-gi chŏ ; Sŏ Kŭm-ja pyŏnjip
Contributors: Sŏ, Kŭm-ja; Chosŏn Nodongdang Ch'ulp'ansa
Series: Chŏngch'i kyŏngjehak haesŏl -- 4
Publisher: Chosŏn Nodongdang Ch'ulp'ansa
Published: 1960
Place of publication: P'yŏngyang-si
Language: kor
Number of pages: 48
Subjects: Labor productivity