This is a recreation of the CP/M Kit Companion Disk that came with the book "CP/M Kit for the Commodore 128". Included in this archive are two .d81 floppy disk images and the book in PDF format. One disk image contains a bootable CP/M 3.0 System Disk and the other is a .d81 floppy disk image of the CP/M Kit Companion Disk.  See the associated screenshots for listings of the contents on both disks.

I found this disk image on archive.org, and while doing some research, also found this thread on Lemon64.  Here is a link to the book elsewhere on this site.