"study number","owner","title","investigators","doi","time period"
"02756","SAMHDA","Drug Abuse Warning Network (DAWN), 1994: [United States]","United States Department of Health and Human Services. Substance Abuse and Mental Health Services Administration. Office of Applied Studies","http://dx.doi.org/10.3886/ICPSR02756.v2","1994"
"02834","SAMHDA","Drug Abuse Warning Network (DAWN), 1997: [United States]","United States Department of Health and Human Services. Substance Abuse and Mental Health Services Administration. Office of Applied Studies","http://dx.doi.org/10.3886/ICPSR02834.v2","1997"
"34265","ICPSR","Eurobarometer 75.2: Economic Crisis, Volunteer Work, the Environment, Audiovisual Interests, and Helplines for Social Services, April-May 2011","European Commission","http://dx.doi.org/10.3886/ICPSR34265.v1","2011"
"34578","ICPSR","Eurobarometer 77.2: Economic and Financial Crisis, Helplines for Social Services, Railway Competition, Food Production and Quality, and Cyber Security, March 2012 ","European Commission","http://dx.doi.org/10.3886/ICPSR34578.v1","2012"