Chʻŏnyŏnsŏng pʻiimyak kaebal e hwanhan yŏnʼgu
By: yŏnʼgu kigwan Chungang Taehakkyo.
Contributors: Chungang Taehakkyo.
Publisher: Kwahak Kisulchʻŏ
Published: 1970
Place of publication: [Seoul]
Language: kor
Number of pages: 26
Other titles: Studies on the development of natural contraceptives