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"USNG." Fullformexpand.com, https://www.fullformexpand.com/usng/306341. Accessed 18 Jan. 2026.
Fullformexpand.com, 2026. "USNG." Accessed January 18, 2026. https://www.fullformexpand.com/usng/306341.
"USNG." (n.d.). Fullformexpand.com. Retrieved January 18, 2026, from https://www.fullformexpand.com/usng/306341.
USNG. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/usng/306341 (Accessed: 18 January 2026).