As I'm reading this, I want to be sure I understand...In this volume, you ONLY have ONE page of R1 - not the entire three pages (I'll assume it is some type of appendix or end matter and you only need the one page in THIS volume). If I am reading this correctly, then in this volume, you only have R1 - one page of the reference material. The title page should reflect that.
If I've misread your question and you DO have all three pages of R1 in a volume, the title page would read R1-bR1.
Cindi