@misc{oai:repository.dl.itc.u-tokyo.ac.jp:00046346,
 author = {青山, 秀三郎},
 month = {},
 note = {種別: 実習報告},
 title = {開坑及ビ採鉱ニ於ケル手掘ト機械掘ノ比較．},
 year = {1918}
}