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"Y87." (n.d.). Fullformexpand.com. Retrieved May 1, 2026, from https://www.fullformexpand.com/y87/empire-airport-empire-michigan-usa.
Y87. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/y87/empire-airport-empire-michigan-usa (Accessed: 1 May 2026).