@misc{Manson2019,
author = {Manson, S. and Schroeder, J. and Van Riper, D. and Ruggles, S.},
title= {IPUMS National Historical Geographic Information System: Version 14.0},
year = {2019},
doi = {10.18128/D050.V14.0},
publisher = {University of Minnesota},
address = {Minneapolis},
}