Guide entries use linear measure to indicate extent of each collection. Linear measure simply indicates how much shelf space a collection takes up. If a collection amounts to five linear inches, it fills a box that is five inches deep; the other dimensions of the box generally accomodate letter-size or legal-size paper (roughly 12" by 10" or 15" by 10"). It is sometimes useful to imagine how many filing cabinets larger collections would fill. If a file drawer holds about two linear feet of documents, then a collection that extends to 160 linear feet would fill 80 file drawers or 20 four-drawer filing cabinets.
If more detailed inventories exist, the collection codes at the end of each Guide entry serve as links to them. Each entry also has a link to the previous entry in the Guide (<<) and to the next entry in the Guide (>>) and a text entry box that you can use to search our index (type in key words and press Enter).