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 Reading Order 
I have a copy of the series from 1982, first published 1980, which orders the books by in-world chronology.  I looked up the publisher ""Fontana Lions"" and found this site: http://inklingsfocus.com/en_GB/brit_1980.html which states that they were the first to publish the series numbered chronologically.  This would be useful information for the article if we can found a reliable source.-  "