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. document genres
7. [documents by function]

Anotations

Scope note:

Works including books, journal articles, speeches, reviews, research reports that analyze, assess or interpret an historical event, era, or phenomenon, by someone who did not experience first-hand or participate in the events or conditions, and generally utilizing primary sources to do so. Secondary sources often offer a review or a critique. Also included would be reference sources like encyclopedias.