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National Center for Education Statistics <Washington, DC> - Washington, DC : US Gov. Print. Off. - 1973/1974 [?]-

Persistent link: https://www.econbiz.de/10000439918

National Science Foundation / Division of Science …; … - Arlington, Va. - 1997(2000) -

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National Science Foundation / Division of Science …; … - Arlington, Va. - 1989/97(2000) -

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National Science Foundation / Division of Science …; … - 1996-: Arlington, Va. : [Verlag nicht ermittelbar] - Nachgewiesen 1987/94(1996) -

Persistent link: https://www.econbiz.de/10001749358

National Science Foundation / Division of Science …; … - Arlington, Va. - Nachgewiesen 1966/93(1995) -

Persistent link: https://www.econbiz.de/10001749384

National Science Foundation / Division of Science …; … - Arlington, Va. - 1997(1999) -

Persistent link: https://www.econbiz.de/10001685515

National Center for Education Statistics <Washington, DC> - Washington, DC : [Verlag nicht ermittelbar] - Nachgewiesen 1990 -

Persistent link: https://www.econbiz.de/10001662401

National Science Foundation / Division of Science … - Arlington, Va : [Verlag nicht ermittelbar] - Nachgewiesen 1993/95(1995) -

Persistent link: https://www.econbiz.de/10001673134

National Science Foundation / Division of Science … - Arlington, Va. : [Verlag nicht ermittelbar] - 1994 -

Persistent link: https://www.econbiz.de/10001754940

National Center for Education Statistics <Washington, DC> - Washington, DC : [Verlag nicht ermittelbar] - Nachgewiesen 21.[bis]2002(1991) -

Persistent link: https://www.econbiz.de/10001563439