Funding
The work on the articles in this special issue was sponsored by the Urals Federal University, the European Historical Population Samples Network/European Science Foundation and the Norwegian Research Council.
Disclosure statement
No potential conflict of interest was reported by the author.
Notes
1. Minnesota Population Center: http://ipums.org; Canadian Century Research Infrastructure: http://www.ccri.uottawa.ca/CCRI/. See also the special issues of Historical Methods, IPUMS - Integrated Public Use Microdata Series, vol. 32, 1999/3, Building Historical Data Infrastructure: New Projects of the Minnesota Population Center, vol. 36, 2003/1-2, Big Data: Large-Scale Historical Infrastructure from the Minnesota Population Center, vol. 44, 2011/1-2.