MESSER-MG Industires (MSDS for gases)
    -(First click on technical resources, then click on MSDS)

Canada Office Of Biosafety (MSDS for Biological hazards)

Chem-Exper (Belgium)
    -(First search for chemical on upper left side of page, then click MSDS)

Mallinckrodt/ J.T. BAKER

Fisher Scientific (Acros Chemicals, Curtin Matheson Scientific)
    -(phone them to get MSDS faxed back to you)

CCOHS, (Canadian Centre for Occupational Health and Safety)
    -(Click on CCINFOweb from the left-hand side bar, then click on the database you wish to access)

Commercial Site containing links to many MSDS sites (some of which are listed above)