51.
 |  | Title: Detection and Classification of Ice (Series: Electronic and Electrical Engineering Research Studies: Radar and Sonar Series Number 1 Series Editor: J. Clarke) by E.O. Lewis, B.W. Currie, S. Haykin ISBN: 0863800580 Publisher: Research Studies Press Ltd Pub. Date: 01 June, 1987
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52.
 |  | Title: The Yale Edition of Horace Walpole's Correspondence: 48. Complete Index V: Sallust to Zweibrucken by H. Walpole, W.S. Lewis ISBN: 0196480434 Publisher: Oxford University Press Pub. Date: 15 September, 1983
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53.
 |  | Title: The Yale Edition of Horace Walpole's Correspondence: 46. Complete Index III: Grazioso to Moldavia by H. Walpole, W.S. Lewis ISBN: 0196480418 Publisher: Oxford University Press Pub. Date: 15 September, 1983
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54.
 |  | Title: The Yale Edition of Horace Walpole's Correspondence: 44. Complete Index I:A.A. to Constant by H. Walpole, W.S. Lewis ISBN: 0196480396 Publisher: Oxford University Press Pub. Date: 15 September, 1983
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55.
 |  | Title: The Yale Edition of Horace Walpole's Correspondence: 47. Complete Index IV: Mole to Sallier by H. Walpole, W.S. Lewis ISBN: 0196480426 Publisher: Oxford University Press Pub. Date: 15 September, 1983
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56.
 |  | Title: The Yale Edition of Horace Walpole's Correspondence: 45. Complete Index II: Constantine to Grazing by H. Walpole, W.S. Lewis ISBN: 019648040X Publisher: Oxford University Press Pub. Date: 15 September, 1983
|