@book{oai:obihiro.repo.nii.ac.jp:00003187,
 author = {Gemma, Takuma and 源馬, 琢磨 and Shimada, Tohru and Hongo, Akio and 本江, 昭夫},
 month = {},
 note = {application/pdf},
 publisher = {Obihiro University of Agriculture and Veterinary Medicine},
 title = {Development of upland field cropping in Japan},
 year = {1980}
}