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The first work of Paul Otlet and Henri La Fontaine in the late nineteenth century in the International Institute of Bibliography was to design a new form of bibliographic directory as a new tool to access information. The use of mobile forms, classified according to the universal language of the Universal Decimal Classification, allowed a faster and more efficient update of this tool and its use worldwide. The first example of dematerialization of knowledge, the Universal Bibliographical Index is now considered the first model of a search engine.