OCLC search keys (Numeric)

• an = OCLC Number (OL or AF)

• bn = ISBN (OL or AF)

• cd = CODEN (OL)

• gn = Government Document Number (OL)

• ln = LC Control Number (LCCN) (OL or AF)

• mn = Music Publisher Number (OL)

• sn = ISSN (OL or AF)

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