Some items in the collection may have accompanying material in a different format, for example, a book with a computer disk or video. If these pieces are shelved separately, the online catalog will indicate this, and will be marked with the location of the accompanying media. The online catalog display will indicate the location for each item listed. The display shows first which Northeastern library has the item, its general location within that library, its status, and then the call number. The University Libraries use the Library of Congress call numbers system, an alphabetical arrangement of books by the initial letter.
Books are further sub-arranged by the next set of letters and numbers.
This number is preceded by a decimal.