The Computer History Museum  published a “Guide to the Thomas J. Buckholtz, Raymond deSaussure, and George Michael Computer Manual Collection” .
The Guide notes, “The scope of the Thomas J. Buckholtz, Raymond deSaussure, and George Michael Computer Manual Collection spans the rise of the information age during the second half of the twentieth century. The Collection reflects, among other areas, mainframe computers, minicomputers, personal computers, input and output (I/O) devices, computer storage and memory devices, software development, supercomputing and networking materials. … The bulk of the materials are computer manuals (40%) and marketing materials (30%). Also included are specifications, technical papers and technical reports from 1950 through 1990. The bulk of the materials cover 1960 to 1982. The Collection represents over 580 individual companies or institutions producing items ranging from peripheral devices, one-of-a kind machines to mass-produced computers.”
The Guide lists the 580 companies or institutions.
Click for information about Thomas J. Buckholtz.