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To solve the problem of access to unpublished documents in the field of scientific research, technology and social and economic sciences, a group of European documentation centres, aided by the Commission of the European Communities, decided in 1981 to develop a cooperative information system to identify and supply this type of document, termed grey or non-conventional literature. Grey literature comprises reports, minutes, technical reports, papers, regulations, working documents and notices issued by local authorities which are not published and which cannot therefore be obtained through the normal commercial publication channels. It was the tremendous problems involved in the identification, acquisition and bibliographical control of this type of literature which led the principal European information and documentation centres to set up SIGLE (System of Information on Grey Literature in Europe). To enable the development of the SIGLE system, backed by the Commission for four years, to continue, a European association has been set up under Luxembourg law: EAGLE (European Association of Grey Literature Exploitation), comprising major Belgian, British, French, German, Italian, Luxembourgish and Dutch information and documentation centres. Its main aim is to promote the exploitation of European grey literature and to continue to improve services to European users through the SIGLE data base. More than 80 000 documents are now stored in the SIGLE data base and the number is growing steadily by some 30 000 documents a year. The fields covered include: aeronautics, agriculture, phytology and veterinary sciences, the social sciences, biological and medical sciences, chemistry, the geo-sciences, electronics and electricity, energy, materials, mathematics, civil, industrial and marine engineering, methods and equipment, military science, missile technology, navigation and telecommunications, shipbuilding, physics, propulsion and fuels, and space technology. The SIGLE data base is availablef for on-line documentary research via Euronet DIANE, accessed on BLAISE-LINE in the United Kingdom and INKA in the Federal Republic of Germany. information on EAGLE and the SIGLE data base can be obtained from: Mr. Marcel Maurice Commission of the European Communities DG XIII-A-2L-2920 LUXEMBOURG.