Developing Linguistic Corpora

Here is a nice guide for corpus linguistics entitled Developing Linguistic Corpora at:
http://ahds.ac.uk/creating/guides/linguistic-corpora/index.htm

Contributors to this online text are John Sinclair, Geoffrey Leech, Lou Burnard, Paul Thompson and Martin Wynne (editor).

This text is not written for the English teacher in mind and some technical points may be difficult to grasp.