Character position definition and scope:

A one-character alphabetic code indicates the generation aspect of a microform.  A fill character ( | ) is used when no attempt has been made to code this position.

Record requirements for National-level and Minimal-level records:  Optional.

Guidelines for applying content designators:

Code:

Description:

a

First generation (master)

b

Printing master

c

Service copy

m

Mixed generation

u

Unknown

|

No attempt to code

To return, select:

007:  Microform

007  Physical Description Fixed Field