- unitdate
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{"value"=>"undated", "type"=>"inclusive"}
- unittitle
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{"value"=>"Metastasio, Pietro"}
- scopecontent
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{"value"=>"<p> See also <span class=\"title\">Gasparo Angiolini and an Unpublished Letter of Metastasio</span> by Carlo Blasis in Box 39, Folder 12</p>"}
- container
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{"type"=>"box", "value"=>"40"}
{"type"=>"folder", "value"=>"5"}
- unitid
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{"type"=>"local_mss", "value"=>"682951"}