I mean that I would put the Envision It section, the full TOC, the glossary, the word list and the Vocabulary Handbook - in that order - into a supplemental volume. (The Vocabulary Handbook is numbered with the W.) Each unit (volume) has questions in it that refers to the Envision It section and the Vocabulary Handbook section. It seems redundant to me to include these sections (41 print pages) in each volume ... but I will if necessary. That's why I'm seeking an expert's opinion.
P.S. This is a sixth grade reading book. The order of the print is: Envision It, TOC, Units 1-3, Glossary, Word List and Vocabulary Handbook.