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006 Additional material characteristics. Optional as needed
Use this optional field when a collection has substantial characteristics of a form of material that is additional to the main one entered in LDR/06. It is like an extra >008 field (>008 being non-repeatable) and allows for additional searching by format.
For example, the archivist might use it to capture the fact that an otherwise textual manuscript collection contains a significant amount of drawings. It is recommended that an 006 be added when you have a series of materials not represented in the 008, or if you find the bulk substantial enough to mention the type in the >300 field.
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035 System control number. Optional
[updated 06/12/2014]
A control number of a system other than the one whose control number is contained in the field 001 above.
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