erc:
who: Geological Survey (U.S.)
what: Marshall East Quadrangle
when: 1978
where: https://texashistory.unt.edu/ark:/67531/metapth452419/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://texashistory.unt.edu/ark:/67531/