The PM PrepCast follows the PMBOK Guide. We even selected a very similar numbering system. So for example, if you read chapter 5.3 in the PMBOK Guide, then you know that the PrepCast lessons for this chapter will also have the number 5.3. That's easy and straightforward.
l'm not aware of a document, but it's fairly easy to figure out. The PM Prepcast follows almost exactly with the PMBOK guide and within the first couple of minutes Cornelius states the pages covered in the 6th edition.
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®