- unitid
-
{"value"=>"1000762", "type"=>"local_mss"}
- unitdate
-
{"value"=>"May 25, 1950", "type"=>"inclusive", "normal"=>"1950-05-25"}
- date_inclusive_start
-
1950
- date_inclusive_end
-
1950
- keydate
-
1950-05-25
- date_start
-
1950-05-25
- date_end
-
1950-05-25
- unittitle
-
{"value"=>"<span class=\"title\">Introductory Study of Methods Useful to Reduce Noises caused by Rapid Transit Electric Railways</span>"}
- physdesc
-
{"format"=>"structured", "physdesc_components"=>[{"name"=>"extent", "value"=>"2 copies"}], "supress_display"=>true}
- container
-
{"type"=>"box", "value"=>"2"}
- extent_statement
-
2 copies