This is what the appendix is best used for. It provides supplemental information which goes with the text, but isn't necessary to read in line with the text. The appendix can hold tables and charts. It can hold source material (that is out of copyright, of course). It can hold any sort of supplemental information.
In terms of page numbering, some people keep on numbering with the standard page numbers here, while others switch over to roman numerals. It depends on your book and your layout.
The plural of appendix is appendices. It's a good idea, if you have multiple, to list each one in the table of contents along with a title for it. That way someone who wants to skip to a particular appendix and read just that can do that.
For most of my books I donít have appendices, but I do have them for my medieval books to discuss historical topics such as the role of women in medieval times.
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