MSDS SheetsThis site claims to be the clearinghouse for MSDS sites on the Internet. Many different kinds of searching allowed, including by manufacturer. Includes links to all important MSDS sites, with search engines for each one.
MSDS Sheets A site from VWR.com. Thousands of chemicals available but no searching by registry number. No need to register, either.
MSDS Sheets This site claims to have thousands of MSDS sheets available in PDF format, free. Registration is free.
The computer catalog should be checked for books on your subject. UML'sDissertations Databasewill give you a list of all UML theses and dissertations in chemistry up to 1985. ProQuest's Dissertations Abstractswill allow you to search all dissertations since 1870. For recent dissertations, you may access the first 24 pages of any dissertation. Copies of all UML theses 1998- are free on ProQuest's site.