Higuma, ezoshika seisoku jittai chōsa hōkokusho
Subtitle: yasei dōbutsu bunpu tō jittai chōsa (ezoshika 1991-1996-nendo)
By: [henshū Hokkaidō Kankyō Kagaku Kenkyū Sentā]
Published: 1997
Language: jpn
Number of pages: 100