Steven Ruggles
@histdem
Historical demographer and data impresario
ID: 2836764008
http://www.umn.edu/~ruggles 01-10-2014 14:44:22
3,3K Tweet
4,4K Followers
303 Following
@histdem
Historical demographer and data impresario
ID: 2836764008
http://www.umn.edu/~ruggles 01-10-2014 14:44:22
3,3K Tweet
4,4K Followers
303 Following