Thanks for your advices!

I used my Plus with System 7.1 to have a look at the disks. I first locked them and made images with Disk Copy 4.2.

So the content is save now.

You can download the images at:

Disk 1

http://macintosh.vanegten.com/Tops(lisa)1.image.hqx

Disk 2

http://macintosh.vanegten.com/TopsDisk2of2(lisa).image.hqx

I don't know how to use the software.

If somebody knows...

You are welcome to add this information to this tread.