2018-04-19T08:18:06Z https://teachinghistory.org/oai2 Teachinghistory.org https://teachinghistory.org/oai2 2.0 jmccartn@gmu.edu 2008-05-14T21:08:36Z no YYYY-MM-DDThh:mm:ssZ yes oai teachinghistory.org : teachinghistory.org:123