1
by Richter, R.
Published in Allgemeine Schulzeitung (1844)
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2
by Richter, R.
Published in Allgemeine Schulzeitung (1839)
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3
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11
by Richter, R.
Published in IPA-IAO Forschung und Praxis (1993)
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12
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13
by Richter-R
Published in Kyklos (1992)
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15
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