@misc{Ruggles2024,
author = {Ruggles, S. and Nelson, M.A. and Sobek, M. and Fitch, C.A. and Goeken, R. and Hacker, J.D. and Roberts, E. and Warren, J.R.},
title= {IPUMS Ancestry full count data: Version 4.0 1850–1940},
year = {2024},
}