Hi,
I thought this might interest people. Most of the scans of the 6.1 manuals are very average, as a result the images are non-existent. So when I found these on the Internet Archive, I was more than happy. Still, in my view, they cannot replace the physical manuals.
Hopefully I will find some soon.
https://archive.org/details/masm-6.1-manuals-high-quality-pdf (https://archive.org/details/masm-6.1-manuals-high-quality-pdf)I believe that...well hope that everything...most stuff on the Internet Archive is public domain.
Cheers,
Craig