Final answer:
Special subjects in alphabetic storage arrangements include collections of memorabilia, atlases, maps, and GIS, which are organized in a specialized area, providing detailed thematic information for research purposes.
Step-by-step explanation:
In an alphabetic storage arrangement, special subjects like memorabilia are meticulously categorized and may be housed in a dedicated room or section within a facility such as a library or archive. Typically, these specialized collections also contain valuable resources such as local or regional atlases, maps, and geographic information systems (GIS).
These resources are not limited to displaying roads and territorial boundaries; they also provide rich information on various thematic aspects like population density, language patterns, and soil types. When conducting research, such maps and atlases serve as primary data and can be quite significant in aiding various projects.