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| Dataset | update: {"subject"=>[nil, "Social Sciences"]} | 2018-02-09T16:04:45Z | 
| RelatedMaterial | update: {"link"=>["http://dx.doi.org/10.5860/crl.78.2.201", "https://doi.org/10.5860/crl.78.2.16582"], "uri"=>["10.5860/crl.78.2.201", "10.5860/crl.78.2.16582"]} | 2017-11-20T20:11:36Z | 
| Dataset | update: {"version_comment"=>[nil, ""]} | 2017-11-20T20:11:36Z | 
| RelatedMaterial | update: {"link"=>["http://crl.acrl.org/content/early/2016/04/20/crl16-923.full.pdf+html", "http://dx.doi.org/10.5860/crl.78.2.201"], "uri"=>["http://crl.acrl.org/content/early/2016/04/20/crl16-923.full.pdf+html", "10.5860/crl.78.2.201"], "uri_type"=>["URL", "DOI"], "citation"=>["Wilkin, J.  “How Large is the ‘Public Domain’? A comparative Analysis of Ringer’s 1961 Copyright Renewal Study and HathiTrust CRMS Data,” accepted to appear in College & Research Libraries, May 2017.", "Wilkin, J.  (2017). “How Large is the ‘Public Domain’? A comparative Analysis of Ringer’s 1961 Copyright Renewal Study and HathiTrust CRMS Data,” College & Research Libraries, 2(78).  doi:10.5860/crl.78.2.201"]} | 2017-02-01T20:45:58Z | 
| Dataset | update: {"keywords"=>["copyright renewals; HathiTrust", "copyright; copyright renewals; HathiTrust"]} | 2016-08-19T19:22:53Z | 
| RelatedMaterial | update: {"link"=>["http://crl.acrl.org", "http://crl.acrl.org/content/early/2016/04/20/crl16-923.full.pdf+html"], "uri"=>[nil, "http://crl.acrl.org/content/early/2016/04/20/crl16-923.full.pdf+html"], "uri_type"=>[nil, "URL"], "datacite_list"=>[nil, "IsSupplementTo"]} | 2016-08-19T19:16:35Z | 
| Dataset | update: {"keywords"=>["copyright renewals", "copyright renewals; HathiTrust"]} | 2016-08-19T19:16:35Z |