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Until this becomes available , please use the resources listed under Online Catalogues to learn about the library holdings of the participating institutions . The IUCN Red List is widely recognized as an authoritative and objective system for classifying species by their risk of extinction , with threat status categories ranging from Least Concern to Extinct . Ironically a possible factor in the failure of the expedition was the indiscretion of Giuseppe Mazzini , compiler of this account , who , believing that there was no postal censorship in Britain , mailed details of the plot to another Italian revolutionary in London . Also included in this collection are : a letter of Rosenberg 's written from the trenches , a letter from a friend onto which Rosenberg has added a watercolor drawing , and a self-portrait in pencil , all of which are part of the library 's holdings . Red List Indices ( RLIs ) use information from the IUCN Red List to illustrate net changes in the overall threat status of sets of species , based on their population , range size and trends . By late August over 300 formal catalogue records for items from the collection were already available in the library 's online catalogue , at http://libcat.csd.sc.edu , and more become available each month . The tall building in the center of the picture is the bookshop and printing-office of the Jackson brothers , who in 1827 printed and published the Tennyson boys ' Poems by Two Brothers . The pointed gables on the right are the roof of the Gothick dining room that the Rector , Tennyson 's father , built himself to accommodate his eleven children . At the global level , 17 per cent of the protected areas are currently not classified under the IUCN scheme . The purpose of the expedition was the overthrow of the Bourbon monarchy of Sicily and Naples and the precipitation , by this act , of unification of the Italian peninsula . The Campanella Collection also contains a copy of the 1850 , three-volume second edition of Il Don Pirlone formerly in the library of Count Potocki . In the event , however , Garibaldi led the expedition himself , preempting Cavour , who did not dare to intervene directly ; La Masa accompanied the expedition as one of its leaders . From the 1860 's successive publishers had persuaded the poet to allow his separate works to be issued together as the Cabinet Edition , the People 's Edition , the Library Edition , and so on , but Tennyson held out firmly against the provision of any annotation .