Subject Heading Maintenance

Acceptable Subject Headings
Correcting Subject Headings

Acceptable Subject Headings

650
 
0
 LC Subject Headings
650

7
NASA Subject Headings
651

0
LC Geographic Subject Headings

There must be at least one subject heading with a 2nd indicator of 0 or 7 on each bibliographic record. If valid subject headings are present, delete all subject headings with other values entered as the 2nd indicator. 

Correcting Subject Headings

Corrections may be made to preserve and update invalid subject headings if there are no valid subject headings on a bibliographic record. It may be necessary to import the OCLC record if other fields (856, etc.) have been substantially updated.