Glad to hear that others find value in these historical manuals..
I have collected a few also. The XT and AT manuals
have
etched writing on the outside. PC-DOS 3.10 (don't have
3.00) and later in the 3.xx series have a paper cover.
And I have PC-DOS 4.00 in the hard cover manual and the
el-cheapo paper box. So I am assuming that this is where
the hard cover manuals stopped.
I think you are right, I have IBM DOS 5.0 but its manual is a
Paperback type..
I have a real nice glass faced wooden book shelf for
their display.
Partly for outward viewing and partly to keep the dust out.
My collection is centered in the family room and is always the
subject of conversation when I have guests over..
All my other reference books and manuals are filed in the garage so I
can get to them if I need one in a hurry.. And I have many Boxes full of
them..
Phil..