ISBNAn ISBN (International Standard Book Number) is a unique
number assigned to each book. To search by ISBN, omit all
hyphens between digits. Jump to top ISSNAn ISSN (International
Standard Serial Number) is an eight-digit code that identifies a
particular serial. When searching by ISSN, you may either omit
or include the hyphen. If you do not type the hyphen, you must
replace it with a space. Jump to top An OCLC Number is an
accession number assigned by the OCLC system when a record is
added to WorldCat. Some OCLC numbers include the prefix "ocm."
Ignore this prefix and enter the number. If an OCLC number is
fewer than eight digits, add the appropriate number of zeros to
the beginning of the number to create an eight-digit number. For
example, the OCLC number 1565173 should be searched as 01565173.
In WorldCat, the OCLC number is labeled Accession No. Jump to
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