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1. The first line of a call number may begin with one, two, or three letters. These letters should be read alphabetically. A call number that begins with A is shelved before one that begins with B, C, etc.; and a call number that begins with QE is located somewhere before the one that starts with QL.
2. The second line of a call number is made of a number that may have one or more digits.This line is read numerically. A call number with a smaller number in its second line is placed before one that has a larger number for its second line:
3. The third line
But, the tricky part of the 3rd line of the call number is that its numerical component is
This makes sense if you read the numbers as decimals!
4. The final lines of the call numbers may include dates, volume indicators, issue numbers, copy numbers, and other annotations such as supplement or index specifiers. These annotations are read after the call number.
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