@misc{NCHS2023,
author = {NCHS},
title= {NCHS urban rural classification scheme for counties},
year = {2023},
URL = {https://www.cdc.gov/nchs/data-analysis-tools/urban-rural.html?CDC_AAref_Val=https://www.cdc.gov/nchs/data_access/urban_rural.htm},
publisher = {NCHS},
address = {Hyattsville, MD},
}