What should I call each book in a series of similarly-themed books?

I am putting together a ‘playbook’ which contains resources related to a key growth driver for the operations team of my company. It is a series of playbooks designed to provide resources / guidelines / standards. So the first release had foundational stuff, the second has the latest priorities, the next one will have info on capital investments and so on. In the accompanying email, I was planning to say "We present to you the latest issue of our very own xxx Playbook – #2 in a series of planned Playbooks designed to support you in your market’s priorities with xxx" My question is: Is the word "issue" suitable in this context? The content is different from the first issue however it revolves around the same main item (the business growth driver). FYI, this playbook is released quarterly. Thanks very much in advance!