Cataloged materials may be found using location keys shown in the diagrams below (click to enlarge). Example: C2NT indicates stack C2, north side, top module.
A second tier of bookcases is stacked on top of the 'C' (central) cabinets. These are the 'T' (for "top") bookcases. They are labeled T1 through T5 with a north/south designation. (Ex: T1N is the first bookcase encountered on the north side of the stack.) There is also a single bookcase at the east end of this stack, labeled 'TE' (for top, east).
For a module with several shelves, the shelf may be indicated by appending a period and the shelf number (starting at 1 for the bottom shelf). Example: S1.1.
See Photocopying Materials in the Archives for suggestions on low-impact ways to copy materials in the archives.