TY  - BOOK
AU  - Zenz, Carl.
AU  - 
ED  - 
ED  - 
ED  - 
ED  - 
TI  - : principles and practical applications 
SN  - 815198647
SN  - 2
PY  - 1975///];copyright 1975.46
CY  - Chicago
PB  - Year Book Medical Publishers
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Occupational Medicine.;Occupational Diseases
N1  - Includes bibliographies and index; 5
ER  -