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The Yale University Library has some of Ruga's maps in its collection, and lists them here: http://yufind.library.yale.edu/yufind/Author/Home?author=Ruga%2C%20Pietro. Interestingly, that page has a text blurb on Ruga that comes from this Wikipedia page; I have seen the text of this page on a number of sites courtesy of Yahoo, even though this page itself doesn't have a source for the text. Morfusmax (talk) 16:34, 16 April 2013 (UTC)[reply]
