Abstract: THE MATHEMATICS OF HYDROLOGY AND WATER RESOURCES by E. H. LLOYD, T. O'DONNELL and J. C. WILKINSON Academic Press Inc. (London) Ltd. 24/28 Oval Road, London NW 1 and Academic Press Inc., Ill fifth Avenue, New York, N.Y. 10003, 1979 138 pp. Hardcover, Clothbound, 16 cm x 24 cm offset. ISBN 0-12-45 3350-7. Price $ 20,50, Dfl. 41,-.