ERAS (CHRONOLOGY)
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BTYEAR + MONTHS + WEEKS + OTHER SHORT PERIODS (CHRONOLOGY)
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UDC529.21
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Descriptor GERÄREN + ZEITALTER + ZEITRECHNUNGEN (CHRONOLOGIE)
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Descriptor ENGERAS (CHRONOLOGY)
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Descriptor FREÈRES (CHRONOLOGIE)
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Variant GERZEITALTER (CHRONOLOGIE)
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Variant GERZEITRECHNUNGEN (CHRONOLOGIE)