Kankyō eikyō hyōka seido no genjō
Subtitle: unʼyō to mondaiten
Series: Shōwa 55-nendo dai 23-kai kaigai kenshū hōkoku -- no. 3
Publisher: Tōkyō-to Shokuin Kenshūjo
Published: 1981
Place of publication: Tōkyō
Language: jpn
Number of pages: 26
Notes: Cover title.