2026-04-04T14:19:46ZZ http://www.lib.hokudai.ac.jp/hoppodb/oai2.php Hokkaido University Northern Studies Collection http://www.lib.hokudai.ac.jp/hoppodb/oai2.php 2.0 js@lib.hokudai.ac.jp 2000-01-01T00:00:00Z transient YYYY-MM-DDThh:mm:ssZ gzip oai hoppo.lib.hokudai.ac.jp : oai:hoppo.lib.hokudai.ac.jp:0A000000010000000