Let's start with the SDK 2.7 Release Notes and Addendum:
3DO M2 V2.7 - Part 1 - Release Notes.pdf
3DO M2 V2.7 - Part 2 - Mercury Programmer's Guide.pdf
3DO M2 V2.7 - Part 3 - Command List Toolkit.pdf
3DO M2 V2.7 - Part 4 - Link-Dump Programmer's Guide.pdf
Those are all OCR'ed and render VERY slow in Acrobat Reader, and they may also contain some errors due to the OCR process. However, they should be very useful nonetheless. I have them in non-ORC'ed form as well, but as you can imagine, they are much, much larger and look more rough when printed out.
All credits for scanning and OCR'ing go to GammaDev.
If someone, preferably from Germany, owns the whole set of documentation and would be willing to provide me Volume 2 of it for scanning, please contact me! All other volumes are scanned already (thousands of pages!).
Fixed filenames to prevent download problems.