1. The first letter is the class. Any additional letters are the item's subclass. The classes are arranged alphabetically in the stacks, with the subclasses are arranged alphabetically within the alphabatized classes.
2. The next portion of the call number is a one to four digit number. A call number with a smaller number is shelved before one that has a larger number. Some of these numbers may be divided by a decimal: these are also read numerically (smaller numbers are shelved before larger numbers). The books categorized in this subject will all be shelved within this range.
3. The final information needed is the series of letters and numbers that follow the decimal point. Sometimes there are two letter and number combinations that follow a decimal. The first grouping, in these cases, is related to the subject of the work. The second grouping is related to the author. Use these shelving rules to quickly find the call number you are looking for:
4. Finally, within parenthesis is the year of publication.