Bob Munck in 1970Xanalogical Structures (Ted Nelson, inventor of Project Xanadu, was a Hypertext colleague—he also coined the term “hypertext”)
Hypertext Editing System (HES) console in use at Brown University (1969)
Hypertext Editing System (HES) creator/director Andries "Andy" van Dam showing colleagues the importance of “error messages” (1969)