The 5-volume set consists of the following:
The following video is from Skyline College and refers to an assignment that they are working on. The directions that the instructor (Kim Lim) provides are helpful, though, for your assignment. She discusses specifically how to use the Bergey's Manual of Systematic Bacteriology.
While the video above will show you how to use the manual, you can also use the steps below to help you with the process.