TY - RPRT TI - Letter Circular 1123: energy design economics AU - Marshall, Harold E AU - Ruegg, Roasalie T AU - Wilson, Forrest PY - 1980 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - LCIRC 1123 DO - 10.6028/NBS.LCIRC.1123 ER -