Authorized subject headings are an excellent way to locate relevant materials in the Library of Congress Online Catalog. Given the large number of pertinent subject headings for researching the topic of English as a second language, the list here comprises a selection of the most effective ones for research. Click on each linked heading below to browse the online catalog for collection materials on that subject, and to see related broader or narrower headings. To search for additional subject headings, we recommend using the “Browse” search using the "SUBJECTS beginning with" option, then enter the subject heading words in the box.