erc:
who: United States. Bureau of the Census.
what: P.L. 94-171 County Block Map (2010 Census): Culberson County, Block 37
when: 20101214
where: https://texashistory.unt.edu/ark:/67531/metapth385736/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://texashistory.unt.edu/ark:/67531/