erc:
who: U.S. Coast and Geodetic Survey
what: United States - East Coast, Delaware - Pennsylvania - New Jersey, Delaware River, Wilmington to Philadelphia.
when: 1959
where: https://texashistory.unt.edu/ark:/67531/metapth220481/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://texashistory.unt.edu/ark:/67531/