https://mud.isr.umich.edu/nhats_data/nhats-geographic-files/2023-02-20T16:05:21+00:00https://mud.isr.umich.edu/nhats_data/nsoc-geographic-files/2023-02-20T16:19:40+00:00https://mud.isr.umich.edu/nhats_data/nhats-restricted-tracker-files/2023-02-20T16:20:38+00:00https://mud.isr.umich.edu/nhats_data/nhats-1940-census-files/2023-02-20T16:20:52+00:00https://mud.isr.umich.edu/nhats_data/nhats-1940-census-geographic-files/2023-02-20T16:21:07+00:00https://mud.isr.umich.edu/nhats_data/nhats-covid-19-geographic-file/2023-02-20T16:21:31+00:00https://mud.isr.umich.edu/nhats_data/nhats-restricted-covid-19-file/2023-02-20T16:21:52+00:00https://mud.isr.umich.edu/nhats_data/nhats-sensitive-files/2023-02-20T16:22:37+00:00https://mud.isr.umich.edu/nhats_data/nhats-sensitive-covid-19-files/2023-02-20T16:22:56+00:00https://mud.isr.umich.edu/nhats_data/nhats-public-use/2023-02-20T16:23:13+00:00