erc: who: Brenner, Paul what: Problems Involved in the Choice and Use of Materials in Airplane Construction when: 19320200 where: https://digital.library.unt.edu/ark:/67531/metadc63599/ erc-support: who: University of North Texas Libraries what: Permanent: Stable Content: when: 20081203 where: https://digital.library.unt.edu/ark:/67531/