Curious Clouseau, if you know the name of the book of Cecil Sheridan's lyrics, you might find it on abebooks.com (or abebooks.co.uk), alibris.com (or .co.uk), biblio.com, powells.com or ebay. I've bought the most surprising books through all of these, including out-of-print and very rare books (though I'm still looking for Edward Martyn and the Irish Theatre).