erc: who: Cabello, Manuel what: [Letter from Manuel Cabello to Internal Revenue Service - 1977-05-11] when: 19770511 where: https://texashistory.unt.edu/ark:/67531/metapth251058/ erc-support: who: University of North Texas Libraries what: Permanent: Stable Content: when: 20081203 where: https://texashistory.unt.edu/ark:/67531/