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Institute of Education Sciences <Washington, DC> - Washington, DC : US Gov. Print. Off. - 1975 - 11.1985; 1986 - 1987; 1992 -

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

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USA / Office of Educational Research and Improvement - Washington, DC : US Gov.Print.Off. - 1988 - 1991

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Washington, DC - 1.1995(1996) -

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Research Associates of Washington <Arlington, Va.> - Washington, DC - Nachgewiesen 16.1996 - 19.2001; damit Ersch. eingest.

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USA / Department of Commerce - Washington, DC : US Census Bureau - Nachgewiesen 1996(1998) -

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USA / Department of Commerce - Washington, DC - Nachgewiesen 1980/81(1985) -

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

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Washington, DC : US Gov. Print. Off. - 1992 nachgewiesen

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