erc:
who: United States. Environmental Protection Agency. Office of Water.
what: Chapter 2: Management Measures for Agriculture Sources
when: 1990
where: https://digital.library.unt.edu/ark:/67531/metadc949385/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://digital.library.unt.edu/ark:/67531/