erc: who: Van Katwijk, Carl what: Unistrut plan in metal channel including nuts, straps and clamps when: 20000905 where: https://digital.library.unt.edu/ark:/67531/metadc733735/ erc-support: who: University of North Texas Libraries what: Permanent: Stable Content: when: 20081203 where: https://digital.library.unt.edu/ark:/67531/