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"O/ET." Fullformexpand.com, https://www.fullformexpand.com/oet/orbiterexternal-tank. Accessed 18 Feb. 2026.
Fullformexpand.com, 2026. "O/ET." Accessed February 18, 2026. https://www.fullformexpand.com/oet/orbiterexternal-tank.
"O/ET." (n.d.). Fullformexpand.com. Retrieved February 18, 2026, from https://www.fullformexpand.com/oet/orbiterexternal-tank.
O/ET. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/oet/orbiterexternal-tank (Accessed: 18 February 2026).