@article{oai:tsukuba.repo.nii.ac.jp:00049815,
 author = {Masai, Yasuo},
 journal = {筑波大学人文地理学研究, Tsukuba studies in human geography},
 month = {Mar},
 pages = {149--154},
 title = {Urbanization of the United States of America},
 volume = {1},
 year = {1977}
}