TY  - BOOK
AU  - Levenhagen,John I.
AU  - Spethmann,Donald H.
TI  - HVAC controls and systems / 
SN  - 0070375097   
PY  - 1993///
CY  - New York
PB  - McGraw-Hill
KW  - Air conditioning
KW  - Control
KW  - Heating
N1  - Includes index
ER  -