Sōken gojūnen
Subtitle: sōritsu gojisshūnen kinen shuppan
Publisher: Nōgyō Sōgō Kenkyūjo
Published: 1996
Place of publication: Tōkyō
Language: jpn
Number of pages: 510
Subjects: Nōgyō Sōgō Kenkyūjo (Japan); History
Other titles: Sōken 50-nen