"study number","owner","title","investigators","doi","time period"
"08242","ICPSR","Electoral and Demographic Data, 1848-1876:  Massachusetts","Baum, Dale","http://dx.doi.org/10.3886/ICPSR08242.v2","1876"
"04284","ICPSR","White Attitudes Toward Black Civil Equality in the Nineteenth Century:  Iowa's Equal Rights Referenda of 1857, 1868, and 1880","Dykstra, Robert R.","http://dx.doi.org/10.3886/ICPSR04284.v1","1882"