TY  - BOOK
AU  - Whitcher,Charles E.
TI  - Control of occupational exposure to (N2O) in the dental operatory
U1  - 363.11 
PY  - 1977///
CY  - Washington, D.C.
PB  - United States Department  of Interior
KW  - Industrial hygiene
KW  - Industrial safety
ER  -