erc: who: (:unav) unavailable what: 8" Standard Low Pressure Gate Valve Cast Steel 0 - 50 Lbs. Working Pressure when: 19251104 where: https://texashistory.unt.edu/ark:/67531/metapth1141530/ erc-support: who: University of North Texas Libraries what: Permanent: Stable Content: when: 20081203 where: https://texashistory.unt.edu/ark:/67531/