Tuerk, Richard. CEntral still:Circle and sphere in thoreau`s Prose / - 1st.Edn. / - The Hague : Mouton & Co.N.V.,Publishers , 1987 - 104p ; ISBN: 90 279 3351 0 Subjects--Topical Terms: Walden I Dewey Class. No.: O111,6M17 / L5