{"format"=>"structured", "physdesc_components"=>[{"name"=>"extent", "value"=>"4 boxes", "unit"=>"containers"}, {"name"=>"extent", "value"=>"1.67 linear feet", "unit"=>"linear_feet"}]}
{"format"=>"structured", "physdesc_components"=>[{"name"=>"extent", "value"=>"19 computer files", "unit"=>"computer_files"}, {"name"=>"extent", "value"=>"63.4 kilobytes", "unit"=>"kilobytes"}]}
{"format"=>"structured", "physdesc_components"=>[{"name"=>"extent", "value"=>"1 audio recording", "unit"=>"audio_recordings"}]}