https://archive.org/details/bitsavers_ibmdatacomsingGeneralFEHandbookMar69_8597290?view=theater&ui=embed&wrapper=false
ibm :: datacomm :: Y27-0042-1 Teleprocessing-General FE Handbook Mar69 : Free Download, Borrow, and...
From the bitsavers.org collection, a scanned-in computer-related document.ibm :: datacomm :: Y27-0042-1 Teleprocessing-General FE Handbook Mar69