English Word and Letter Frequency
Posted by Daniel on Wednesday, 16 January 2013perhaps your group at Google might be interested in using the computing power that is now available to significantly expand and produce such tables as I constructed some 50 years ago, but now using the Google Corpus Data, not the tiny 20,000 word sample that I used.
English Letter Frequency Counts: Mayzner Revisited or ETAOIN SRHLDCU