erc:
who: United States. Surveyor General.
what: Map of Oregon Territory west of the Cascade Mountains.
when: 1858
where: https://texashistory.unt.edu/ark:/67531/metapth187582/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://texashistory.unt.edu/ark:/67531/