Deep in the application of group theory to molecular spectroscopy one finds a need to analyze the direct products of irreducible representations in the character table of a molecule.

Here is a good online source for those Direct Product Tables.

https://chem.libretexts.org/Ancillary_Materials/Reference/Reference_Tables/Group_Theory_Tables/Direct_Product_Tables

This is a part of a series of pages that serve as a static set of URLs to be used in the references section of my book Spectroscopy Theory in One Dimension through AIP Press.