erc: who: (:unav) unavailable what: ["Nevada Wing Of Boulder Dam PowerHouse"] when: 1925-1935 where: https://texashistory.unt.edu/ark:/67531/metapth9115/ erc-support: who: University of North Texas Libraries what: Permanent: Stable Content: when: 20081203 where: https://texashistory.unt.edu/ark:/67531/