erc:
who: Geological Survey (U.S.)
what: Dallas 2-b Quadrangle
when: 1925
where: https://texashistory.unt.edu/ark:/67531/metapth457283/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://texashistory.unt.edu/ark:/67531/