erc:
who: Walker, James C.
what: Rotary Engine.
when: 18930411
where: https://texashistory.unt.edu/ark:/67531/metapth173378/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://texashistory.unt.edu/ark:/67531/