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Correspondence with T T Hay, 1970 (Japanese watermills), R Herczynski, 1966, J O Hirshfelder, 1968 and G S Hislop,1939, 1973

Letters from Arnold Hall, John Hardy, Harold Hartley, Alec Haslam, Lexie Hawthorne, Edward Hinde, Howard Hinton, George Hislop, W. V. D. Hodge, Alan Hodgkin, H. Geoffrey Hopkins, Herbert Howells, and J. C. Hunsaker.