; ; ; "ActiveFedora::Aggregation::ListSource" . a , ; "Conference on the Measure and Theories of Productivity [announcement]"; ; "batchuser@example.com"; "Announcement"; "1998-10"; "2018-03-29T18:23:18.514057645+00:00"^^; ; "2021-01-15T21:35:48.126121816+00:00"^^; "Conference Proceeding"; "Productivity and the industrial revolution"; "Announcement"; ; ; ; ; "Federal Reserve Bank of Minneapolis. Research Department."; ; "ConferenceProceeding" . ; .