They are or have been distributed by Microsoft.
They distribute IBM.
Microsoft AdventureType: Text only Written 1979 by Gordon Letwin.
Notes: It is also copyrighted by IBM in 1981. It is a version of the original Adventure (they might have added a point for a total of 351). This version of Adventure is almost identical to the MIT version and might be a port.
Adventureland was created by Hans Persson and is now maintained by Stefan Meier.
If you find any errors or have information that is missing, please let me know