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4. City of Boulder. (2015a). “Boulder climate commitment.” ⟨https://www-static.bouldercolorado.gov/docs/11-24-15_Climate_Commitment_PRINT_READY-1-201605231619.pdf⟩ (May 5 2016).
5. City of Boulder. (2015b). “SmartRegs.” ⟨https://bouldercolorado.gov/plan-develop/smartregs-progress-updates⟩ (Dec. 19 2015).