TY - RPRT TI - Energy price indices and discount factors for life-cycle cost analysis: 2020 annual supplement to NIST Handbook 135 AU - Lavappa, Priya D AU - Kneifel, Joshua D PY - 2020 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 85-3273-35 DO - 10.6028/NIST.IR.85-3273-35 ER -