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National Science Foundation / National Science Board - Washington, DC : US Gov.Print.Off. - 8.1987 -

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USA / National Aeronautics and Space Administration / …; … - Washington, DC : US Gov. Print. Off. - Nachgewiesen 1976 -

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Massachusetts Institute of Technology - Cambridge, Mass. : [Verlag nicht ermittelbar] - 100.1997,2 - 101.1998,2

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USA / National Aeronautics and Space Administration - Washington, DC : [Verlag nicht ermittelbar] - Nachgewiesen 1996 -

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