Vol. 4 has audio CD attached inside back cover.
Vol. 8 (cased) has an accompanying CD-ROM.
v. 1. On grammar
v. 2. Linguistic studies of text and discourse
v. 3. On language and linguistics
v. 4. The language of early childhood
v. 5. The language of science
v. 6. Computational and quantitative studies
v. 7. Studies in English language
v. 8. Studies in Chinese language
v. 9. Language and education
v. 10. Language and society.
The collected works of M.A.K. Halliday by M. A. K. Halliday. ISBN 9781847065773. Published by Continuum in 2002. Publication and catalogue information, links to buy online and reader comments.