0xx fields
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001 OCLC: LHR Control Number
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004 Control Number for Related Bibliographic Record (NR)
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007 Physical Description Fixed Field (NR)
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008 Fixed-Length Data Elements-General Information (NR)
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014 Linkage Number (R)
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017 Copyright or Legal Deposit Number (R)
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020 International Standard Book Number (R)
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022 International Standard Serial Number (R)
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023 Cluster ISSN (R)
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024 Other Standard Identifier (R)
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035 System Control Number (R)
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