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1.
図書 |
organised by the European Space Agency, jointly sponsored by the Centre national d'études spatiales and the Deutsche Forschungsanstalt für Luft- und Raumfahrt e.V., and held at ESTEC, Noordwijk, the Netherlands, on 24-26 April 1991
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2.
図書 |
organised by the European Space Agency (ESA), co-sponsored by the Centre national d'études spatiales (CNES) and the Deutsche Agentur für Raumfahrt-Angelegenheiten (DARA) ; [compiled by W.R. Burke]
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