Since it wasn't mounting for me either with the physical disc, or the image... I passed the drive under Qemu and MS-DOS read it fine.
The whole thing was... Strange in that I can't get these old discs to mount. Although they read fine. strange.
It was really fun taking these old CD-ROM's disc images, and actually manipulating the data. I didn't expect to get anything and I was really surprised that it worked.
Can't test with MS bookshelf as there doesn't appear to be an ISO provided
EDIT: Nonetheless thank you for preparing these interesting images!