TY  - BOOK
AU  - Levenhagen 
AU  - Spethmann, Donald H.
TI  - HVAC controls and systems 
SN  - 0070375097
U1  - 697 LEV 1993 
PY  - 1993///
CY  - New York
PB  - McGraw Hill
KW  - Air conditioning
KW  - Control
KW  - Heating
ER  -