These include books on language theory, history of the English language, grammar, spelling, etymology, vocabluary building, reading speed and comprehension, texts for new readers, materials for students learning English as a foreign or second language, and a wide range of dictionaries, both abridged and unabridged, including ones covering specialized aspects of language such as slang, etymology, and historical and regional English. Audiocassette and videocassette materials are also available on these aspects of the English language.
Special emphasis is given to English as a foreign language .
Many audio courses can be used by any learner, but there are special materials for speakers of Spanish, Russian, Chinese, Japanese, Korean, Vietnamese, Hindi, Serbo-Croatian, Arabic and French. In addition to general-use ESL video courses, there are video courses for speakers of Spanish, Russian, Chinese, Vietnamese, and Arabic. Accent reduction materials are also available. For a list of classes on learning English as a second language, check with Social Sciences , which maintains a file as part of their Adult Education File . Materials on sign language are found in 419 .