Like most academic libraries, we use the Library of Congress (LC) classification system for arranging books and other materials on the shelf to make them easy to find and return. “LC” is easier for managing large collections than the Dewey system, which you may already be familiar with from your use of school and public libraries. Like the Dewey system, the LC system puts subjects and topics near each other on the shelf. Check out the LC classification outline to see what subjects the leading letters indicate.
The LC system is similar to Dewey, except that it is an alpha-numeric system, rather than just numbers. You will receive training on LC shelving when you begin work at the library, and should always ask for help if you are unsure of shelving procedures.
An LC call number may look like this on the spine of a book:
PQ
2660
.A4
2004
OR in the online catalog like this: PQ2660 .A4 2004
The first section of the call number, noted by a letter or letters, represents the subject area, so it is read alphabetically. This is followed by a number, and the letter number combination is read in alphabetical and numerical order.
The third line or section of the call number, which features a decimal with letter and number usually represents the author of the work. This should be read as a decimal point. For example, .A35 would come before .A4 on the shelf. Sometimes there is a fifth section with a letter/number combination, and this is read the same way. The last section showing the year represents the date of publication
There are multiple shelving locations for books/materials in the library. Sometimes these are referred to as collections.
Click here to view a tutorial on how to locate the library's collections.
Below is a description and location for each collection.
A call number is like an address for a book. It tells you exactly where to go to find the book, or where the book should be returned. The call number is made up of letters, whole numbers, decimals, a publication date, and occasionally a volume and/or copy number. This allows for each book to have a specific location. One book’s location cannot be confused with another book's location.
For example, a library patron may wish to find William J. Reese’s book, America’s Public Schools. To find this book the patron must go to the library website and search for the book. After the patron conducts the search they will find this call number in the catalog record record:
LA212 .R423 2005
But the call number looks like this on the spine of the book:
LA
212
.R423
2005
Alphanumeric Subject
The Library of Congress classification system uses the beginning letters (LA in the example above) and first line of numbers (212 in the example above) to indicate the subject of the book. In this example, LA 212 = Education > History of Education > United States. As you might expect, the letters are ordered alphabetically. For example, the letter D comes before K, and so forth. Similarly, the letter L (by itself) comes before LA, which comes before LB. The numbers immediately following the first letter(s) are read as whole numbers. For example, 212 comes before 761 but after 115. Sometimes there are decimals in the first number. In these cases, the whole numbers are read as before, but the numbers following the decimal are read as decimals.
How do we read decimals? How are they different from whole numbers?
For example, 212.16 comes before 212.5 because .16 is a smaller decimal number than .50. Similarly, 212.257836 comes before 212.3 because .25783 is a smaller decimal number than .30000.
Cutter Numbers
The next part of the call number (.R423 in our example) is referred to as the Cutter number. It is called a Cutter number after Charles Ammi Cutter, who developed the Cutter Expansive Classification scheme in the late 19th century. This original system was later adapted by the Library of Congress. For more information about Cutter, follow this link: http://www.forbeslibrary.org/about/cacutter.shtml.
Cutter numbers usually refer to the author or title of a book.
Cutter numbers contain letters, which are ordered alphabetically, and decimal numbers. So, for example, .R423 comes after .B76 and .R227, but before .R966 and .T381.
Some books have two Cutter numbers. They are both read as decimals even though the second Cutter number does not contain a decimal (in order to distinguish the two numbers). An example of such a call number is below, with the Cutter numbers in bold:
ML
420
.S77
R33
2004
Date of Publication
The last number in the above example, 2004, is the date of publication. This is to be shelved in chronological order for the same book. For example, a 2004 second edition comes after the original 1978 publication but before the 2006 third edition, and so forth.
Volume Numbers
Sometimes a call number will contain a volume number, labeled v.1, v.2, etc. These are shelved in whole number numerical order within the set of books.
Copy Numbers
A call number will contain a copy number if there are multiple copies of the same book on the shelf, labeled c.1, c.2, etc. These are shelved in whole number order.
One thing to always keep in mind when shelving books and shelf-reading is that nothing comes before something.
If a book contains no volume number, that book comes before a book within a set that does contain a volume number. If a book contains no date in the call number, that book comes before the same book that does have a date in the call number.
Watch this video on the Library of Congress classification system. Then, take the quiz below.
When you have completed the test (whether you've gotten them all correct, or run out of chances), please screenshot the page showing that you've done the shelving quiz, and send it to me at ksalley@transy.edu. If you have any questions, let me know!
As part of your training, it’s time to complete the shelving activities. Below is an explanation for each shelving activity.