Sax's Dangerous Properties of Industrial Materials by 
Bretherick's Handbook of Reactive Chemical Hazards by 
Hazardous Chemicals Desk Reference by 
Assessing Transformation Products of Chemicals by Non-Target and Suspect Screening by 
Managing Hazardous Reactions and Compounds in Process Chemistry by Material Safety Data Sheets are safety information for any potentially dangerous workplace chemical. They are required by OSHA to be available to employees working with chemicals. A few of the many finding aids for MSDS are listed here.
When searching Google for MSDS try either of the following examples, replacing the word "benzene" with the substance of interest.
msds benzene
material safety data sheet benzene