Source: Classification and indexing in science (1958), Chapter 1: The need for classification, p. 12-13.
“It affords an immediate step, however, to associative indexing, the basic idea of which is a provision whereby any item may be caused at will to select immediately and automatically another. This is the essential feature of the memex. The process of tying two items together is the important thing.”
As We May Think (1945)
Context: All this is conventional, except for the projection forward of present-day mechanisms and gadgetry. It affords an immediate step, however, to associative indexing, the basic idea of which is a provision whereby any item may be caused at will to select immediately and automatically another. This is the essential feature of the memex. The process of tying two items together is the important thing.
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Vannevar Bush 57
American electrical engineer and science administrator 1890–1974Related quotes
The Structure of Information Retrieval Systems (1959)

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Source: Practical Pictorial Photography, 1898, Methods - The practical application of means to end, p. 19

Sneesby v. Lancashire and Yorkshire Rail. Co. (1874), L. R. 9 Q. B. Ca. 267.
which nowadays, by the way, ain't all that impressive
An Integral Spirituality
Thomas H. Davenport and J.C. Beck (2001). The Attention Economy: Understanding the New Currency of Business. Harvard Business School Press. p. 20