The memos were written between February and April 1969, and I assume the system being developed eventually was named TENEX. The authors or contributors (apparently) in some cases were Dan Murphy (DLM), Ted Strollo (TRS), Ray Tomlinson (RST), Jerry Burchfiel (JDB), and Ed Fiala (ERF).
If you see any missing pages in these scans, please let me know (dave@walden-family.com). Ultimately I plan to give these to an official archive, probably the Computer History Museum.
TENSYS-1
TENSYS-2
TENSYS-3
TENSYS-4
TENSYS-5
TENSYS-6
TENSYS-7
TENSYS-8
TENSYS-9