@article{oai:teapot.lib.ocha.ac.jp:00013240,
 author = {豊田, 一秀},
 issue = {5},
 journal = {幼児の教育},
 month = {May},
 note = {application/pdf, 一般雑誌記事},
 pages = {38--41},
 title = {堅い土、柔らかい土 (<特集>土)},
 volume = {88},
 year = {1989}
}