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I have the Microsoft C 4.0 Manuals in PDF Form if they are welcome here and need a home.
There are 5 PDF files in this zip file
Just glanced around, are these the same as here: https://www.pcjs.org/pubs/pc/software/tools/microsoft/c/4.00/ ?
I'll make a note to take a closer look at those some time. If they are more or less complete, it probably would be a good idea to add them here.
Yes they do look like them