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While the nature of scientific and technical information, if we disregard the language aspect, is fundamentally planetary, the economic type of information in contrast still remains essentially of a national if not private nature. The natural result is that this information is confined and subject to local constraints and therefore, when accessible, available in a variety of forms. Indeed, as it very often results from either already rather old habits or peculiar legislations, this variety is such that it would take too long to describe it.

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