See the volumes titled Library of Congress Subject Headings for a complete list of possible headings and cross references. 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 Physics Abstracts , before consulting the online catalog. Also, you may use names of well-known physicists as subjects in the online catalog to see if the library owns any books about them.
Many excellent resources are available on the Internet.