erc:
who: United States. War Department.
what: Browning machine gun caliber .50, M2, aircraft, fixed and flexible.
when: 19420430
where: https://digital.library.unt.edu/ark:/67531/metadc29988/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://digital.library.unt.edu/ark:/67531/