TY  - RPRT
TI  - Letter Circular 1085: how to improve the efficiency of your oil-fired furnace
PY  - 1977
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 1085
DO  - 10.6028/NBS.LCIRC.1085
ER  -