TY  - RPRT
TI  - Procedures for testing, rating, and estimating the seasonal performance of engine-driven heat pump systems 
AU  - Maxwell, B R
PY  - 1979
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 79-1911
DO  - 10.6028/NBS.IR.79-1911
ER  -