Most of the Library uses the Library of Congress Classification System.
|PS3551||The numbers following the letter(s) are read as a whole number (three thousand five hundred and fifty-one). PS3551 would come before PS3650.|
|.5||If there are additional numbers immediately after the whole number, you should treat them as a decimal.PS3551.5 would come between PS3551 and PS3552.|
|For the next part of the call number, go to the letter(s) and then treat the number(s) as a decimal. .N257 U53 would come between .N257 U450 and .N257 U6.|
|1999||The final number, if included, is the year of publication.This book was published in 1999.|
|630.51||The number in front of the decimal is read as a whole number (six hundred and thirty), then treat the rest as a decimal. 630.4 would come between 630.31 and 630.52.|
|P884||For the final number, go to the letter first and then read the rest as a whole number. P884 would come between P883 and P885.|
The numbers are read as a whole number (eight thousand nine-hundred and eleven). 8911 would come before 8950.
|.5||If there are additional numbers immediately after the whole number, you should treat them as a decimal. 8911.5 would come between 8911 and 8912.|
|4426||The next number is also read as a whole number.|
Some government publications at D'Angelo are shelved by the Superintendent of Documents Classification System (SuDocs). Boston College has a nice guide to reading SuDocs numbers.
The Library uses two classification systems for legal materials, Benyon K and the Library of Congress K classification. To distinguish the two K call numbers, we precede LC call number with XX (example, XXKF 1000). Both call numbers are read just as you would any other Library of Congress call numbers.