6xx (Subjects)

**Delete any subject headings that have a second indicator other than "0".**
This includes such non-LC subject heading fields as: 653 and 655. Consult a cataloger if there will be no subjects left after you delete incorrect ones.

Examples of subject headings which should be deleted:

650 _6 Zones industrielles |x Aspect de l'environnement |z Canada

650 12 Heart Surgery |x humor.

690 _4 Dance |z Canada |x Directories.

653 _1 fueled cells |a molten carbonate |a power generation

655 _7 Hymnals |z Massachusetts |y 17th century |2 rbgenr