Useful Links

British National Corpus. <http://corpus.byu.edu/bnc/>

Corpus of Contemporary American English. <http://corpus.byu.edu/coca/>

Corpus Research Database. <http://www.helsinki.fi/varieng/CoRD/corpora/index.html>

Google N-Gram Viewer. <https://books.google.com/ngrams>

Gutenberg Project. <http://www.gutenberg.org/wiki/Main_Page>
(Source of free E-books.)

WebCorp Live. <http://www.webcorp.org.uk/live/>
(Tool to analyse the Web as a Corpus)