ALA sponsors Library USA exhibit at the 1964 and 1965 New York World's Fair
"Library/U.S.A. is the information center for the United States Pavilion. It is sponsored by the American Library Association to acquaint you with the indispensable nature of libraries as a national resource. Librarians on duty are prepared to answer any question you may ask. A UNIVAC computer aids them in responding to questions about the exhbits in the U.S. Pavillion. Reference books are used to locate inforamtion on all other subjects." Read more from the United States Pavillion Library booklet.
Libraries and Librarianship: Sixty Years of Challenge and Change, 1945 - 2005 claims this was the first public demonstration of online bibliographic retrieval.