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Fullformexpand.com, 2025. "BTU." Accessed November 22, 2025. https://www.fullformexpand.com/btu/332892.
"BTU." (n.d.). Fullformexpand.com. Retrieved November 22, 2025, from https://www.fullformexpand.com/btu/332892.
BTU. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/btu/332892 (Accessed: 22 November 2025).