This field is an optional fixed-length data field used when an item contains one or more formats in addition to the main one entered in LDR/06. It is like an extra 008 field (008 being non-repeatable). You might use it, for example, to capture the fact that an otherwise textual manuscript contains drawings. There are 18 character positions (00-17).
(00) Enter the code (as in LDR/06) for the additional format of material (in Aleph, this is done from a drop-down menu).
(01-17) Correspond to 008/18-34 for each form of material. Consult the MARC manual for appropriate coding.