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update: {"nested_updated_at"=>[nil, Thu, 20 Dec 2018 16:21:22.154366000 UTC +00:00]}
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2024-01-03T18:23:23Z
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update: {"subject"=>[nil, "Social Sciences"]}
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2018-02-09T16:04:45Z
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update: {"version_comment"=>[nil, ""]}
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2017-11-20T20:11:36Z
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update: {"keywords"=>["copyright renewals; HathiTrust", "copyright; copyright renewals; HathiTrust"]}
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2016-08-19T19:22:53Z
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update: {"keywords"=>["copyright renewals", "copyright renewals; HathiTrust"]}
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2016-08-19T19:16:35Z
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