The Library of Congress classification for linguistics in general is P 1-1091 . Because linguistics crosses over to many other disciplines, other subject classifications may be useful. If you know a specific author or title, you may use that information to access listings in the online catalog also. For searching the contents of journals and other periodicals, it is best to use an index, such as Linguistics and Language Behavior Abstracts , before consulting the online catalog.
Many excellent resources are available on the Internet.