Chemical Hazard Symbols (European/International Standard): Symbols suitable for transport and storage of hazardous chemicals.
Chemistry Safety Manual: Manual for the University of Bristol School of Chemistry.
Internet MSDS and Hazardous Chemical Archives: Large set of links, mainly to various university safety pages, focusing on chemical safety and awareness.
R-Phrases: An index of the "R" Phrases. Used in European labs.
S-Phrases: An index of the "S" Phrases. Used in European labs.
The Lycoming Chemistry Safety Page: From Lycoming Chemistry department.