erc:
who: McCampbell, James B.
what: Soils, Soil Erosion, Soil Conservation & Crop Management
when: 19691100
where: https://gateway.okhistory.org/ark:/67531/metadc1772446/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://gateway.okhistory.org/ark:/67531/