Kankyō eikyō hyōkasho no gaiyō
Subtitle: Ōkawabata Ribā Shiti 21 kaihatsu jigyō
By: [henshū Tōkyō-to Kankyō Hozenkyoku Kankyō Kanribu Kankyō Eikyō Hyōka Shinsashitsu]
Publisher: Tōkyō-to
Published: 1986
Place of publication: Tōkyō
Language: jpn
Number of pages: 74