If you found a book about butterfly migration with a call number of 595.781 G1543b, that number would be based on the Dewey DecimalLibrary of Congress classification system.
Answers
Where do I find the Dewey number in the bibliographic record?
The Dewey Decimal number is found in the MARC 082 field.
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Why do I see two segmentation marks in bibliographic records?
Prior to Edition 22, the rules called for a segmentation mark at the start of every standard subdivision (notation from Table 1) as well as at the end of the abridged number. Old bibliographic records with Dewey numbers from previous editions are generally not updated to reflect current policies.
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How do I know if the Dewey number in the bibliographic record is current?
All bibliographic records should include the edition of the Dewey Decimal Classification that was used to classify the resource. The edition is noted is in the MARC 082 field in subfield 2. Edition 23 is the current edition.
082 00 ‡a 940.3/2252 ‡2 23 (the number is from edition 23)
082 00 ‡a 336.2001/9 ‡2 22 (the number is from edition 22)
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If I see a problem with a Dewey number, whom do I contact?
Please contact the Dewey Program at [email protected] with any questions about Dewey numbers in bibliographic records.
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What is the difference between Library of Congress Classification and Dewey Decimal Classification?
The Library of Congress Classification (LCC) system was developed at the turn of the 20th century and was specifically created to categorize books and other items held in the Library of Congress. It features 21 subject categories with resources being identified by a combination of both letters and numbers. For example, books on education are identified with a call number that begins with the letter “L” and those on political science under “J.” The number of classes and numerous subclasses is not restricted. Specific topics and geographic areas are often represented by alphabetic Cutter lists. LCC notation does not lend itself to abridgment, except all the way to the summary level.