This essay by Vannevar Bush was published in 1945 in the Atlantic Monthly. He describes a system called the memex, a tool for making knowledge more accessible, that is often considered to be one of the precursors of hypertext.
A quote from the editor of the Atlantic
Like Emerson's famous address of 1837 on "The American Scholar," this paper by Dr. Bush calls for a new relationship between thinking man and the sum of our knowledge.
And one from the essay itself: