| Library of Congress call numbers are designed to arrange items according to their subject, so that when you find one item on a topic there should be other similar items nearby.
A Library of Congress Call Number Search lets you do this kind of search from your computer.
Type in as much (or little) of a call number as you wish to:
Q -- This takes you to the beginning of the letter Q (science).
QA -- This takes you to the QA section of call numbers (mathematics).
QA76 -- This takes you to the QA76 section (computer books).
QA76.73 -- This takes you to QA76.73 (programming languages).
QA76.73 C15 -- This takes you to QA76.73 C15 (the C programming language).
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