Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Information Forms (hierarchy name)
5. information forms (objects)
6. information artifacts
7. [information artifacts by physical form]
8. microforms

Narrower term/s

• aperture cards
• ultrafiche

Anotations

Scope note:

Flexible, transparent sheets of film bearing a series of microimages on a flat sheet of film, usually arranged in a grid pattern, to be read by magnification on specially designed equipment; normally having an identifying strip legible without magnification.