Aerial views pose special problems in many areas of the bibliographic description.
There is no clear-cut line between types of aerial views, but various categories have been established to standardized the treatment of each category. All items printed on cloth are included in a special vault collection. The bibliographic description for manuscript items on cloth emphasizes the manuscript aspect of the item and, although the item is filed in the vault, it is not included in the cloth collection. Duplicate copies of cloth maps are retained for the collection. Class these items as general maps or, if appropriate, use another subject Cutter to indicate specific subject content.