The Harpur Euclid. An Edition of Euclid's Elements revised in accordance with the Reports of the Cambridge Board of Mathematical Studies, and the Oxford Board of the Faculty of Natural Science. By E. M. LANGLEY, M.A., and W. S. PHILLIPS, M.A. BOOKS I. and II., 2s. Or separately, BOOK I., Is. 6d. BOOK II., IS. Books I.-IV., 3s. 6d. Books III. and IV., 2s. RIVINGTONS: LONDON |