TitlePeriodIdentifierhttp://gss-data.org.uk/data/gss_data/time/httpgss-dataorgukdatagss_datatradeons-pink-book-trade-in-servicesschemeperiod/datasetContents IssuedSaturday 1 January 2000 at 12:00amContents ModifiedSaturday 1 January 2000 at 12:00am