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Fullformexpand.com, 2026. "GTUB." Accessed April 10, 2026. https://www.fullformexpand.com/gtub/geographic-tabulation-unit-base.
"GTUB." (n.d.). Fullformexpand.com. Retrieved April 10, 2026, from https://www.fullformexpand.com/gtub/geographic-tabulation-unit-base.
GTUB. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/gtub/geographic-tabulation-unit-base (Accessed: 10 April 2026).