○MARC 21的主管單位是美國國會圖書館網路發展與機讀編目標準小組，Network Development and MARC Standards Office, Library of Congress
○MARC 21可分為5種，分別為：
- MARC 21 Format for Bibliographic Data MARC 21格式的書目數據，還有輕簡版(LITE)
- MARC 21 Format for Authority Data MARC 21格式的權威數據
- MARC 21 Format for Holdings Data MARC 21格式的館藏數據
- MARC 21 Format for Classification Data MARC 21格式的分類數據
- MARC 21 Format for Community Information MARC 21格式的社區資訊
○Koha編目系統MARC與中國編目規則第三版(圖書)相對應的欄位(改)
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Koha系統欄位
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中國編目第三版
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AACR2
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International Standard Book Number(020$a)
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標準號碼(裝訂及其他區別字樣)
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International Standard Book Number (Qualification)
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Terms of availability (020$c)
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獲得方式
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Terms of availability
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Personal name(100)
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著者敘述，是權威控制
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Statement of responsibility
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Title(245$a)
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正題名
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Title proper
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Remainder of title(245$b)
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可寫並列題名與副題名，標點符號不同
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Parallel titles : other title information
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Statement of responsibility, etc.(245$c)
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第一著者敘述(三人以上除第一作者，其他寫在700段Personal name)
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First statement of responsibility
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Medium(245$h)
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資料類型標示
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General material designation
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Form(245$k)
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附註
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Note(s)
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Edition statement(250$a)
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版本敘述
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Edition statement
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Place of publication, distribution, etc.(260$a)
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出版地;經銷地
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Place of publication, distribution, etc.
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Name of publisher, distributor, etc.(260$b)
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出版者;經銷者
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Name of publisher, distributor, etc.
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Date of publication, distribution, etc.(260$c)
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出版年;經銷年
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Date of publication, distribution, etc.
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Extent(300$a)
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面(葉)數.冊數或其他單位
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Extent of item
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Other physical details(300$b)
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插圖或其他稽核細節
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Illustrative matter
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Dimensions(300$c)
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高廣
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Dimensions
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Accompanying material (300$e)
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附件
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Accompanying material
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Series statement(490$a)
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集叢正題名
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series statements
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Volume/sequential designation(490$v)
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集叢號
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International Standard Serial Number (490$x)
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集叢之國際標準業刊號
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General note(500$a)
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附註
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Note(s)
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著者敘述
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Statements of responsibility
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