|MadSci Network: Chemistry|
The first reference I recommend is Chemical Abstracts(www.cas.org). Its various kinds of indexes provide a fast way to almost all aluminum compounds. You can also refer to some encyclopedia of inorganic compounds such as Ullmann and Gemlin. Internet site for Ullmann's Encyclopedia of Industrial Chemistry (Sixth Edition) is here. There is also a journal called "Aluminum". Dan Berger adds: For formulas of simple compounds of aluminum, try the Handbook of Chemistry and Physics. Greenwood and Earnshaw's "Chemistry of the Elements" is useful, as is Stwertka's "A Guide to the Elements".
Try the links in the MadSci Library for more information on Chemistry.