@article{oai:repository.dl.itc.u-tokyo.ac.jp:00037674, author = {YOKOYAMA, Matajiro}, journal = {The Journal of the College of Science, Imperial University of Tokyo, Japan}, month = {Jun}, note = {application/pdf}, pages = {1--23}, title = {Molluscan Remains from the Middle Part of the Jo=Ban Coal=Field}, volume = {45}, year = {1925} }