Vannevar Bush, "As We May Think." Atlantic Monthly, July 1945, 101–108.

Theodor H. Nelson, "As We Will Think." Proc. Online 72 Conference, Brunel U. Uxbridge, England.

G. Salton, "Recent Studies in Automatic Text Analysis and Document Retrieval." JACM, Apr 73, 258–278.

Donald E. Walker (ed.), Interactive Bibliographic Search: The User/Computer Interface. AFIPS Press, $15.

Theodor H. Nelson, "Getting It Out of Our System." In Schechter (ed.), Critique of Information Retrieval (Thompson Books, 1967).

J.C.R. Licklider, Libraries of the Future, MIT Press, 1965.
Clear and readable summary of the rest of the field; then he goes on to advocate “procognitive systems,” systems that will digest what’s known in any field and talk back to you, using techniques of artificial intelligence.
Whatever its other merits, this book is great for shaking people up, especially librarians. It seems so official.

Richard M. Laska, "All the News That’s Fit to Retrieve." Computer Decisions, Aug 72, pp. 18–22.