FLORIDA GEOLOGICAL SURVEY Ferris, J. G. 1962 (and Knowles, D. B., Brown, R. H., and Stallman, R. W.) Theory of aquifer tests: U. S. Geol. Survey Water-Supply Paper 1536-E. Harbeck, G. E. 1962 A practical field technique for measuring reservoir evaporation utilizing mass-transfer theory: U. S. Geol, Survey Prof. Paper 272E. 1958 (and others) Water-loss investigations-Lake Mead studies: U. S. Geol. Survey Prof. Paper 298. Hardison, C. H. (see Searcy, J. K.) Healy, H. ( 1962 Hem, John G. Piezometric surface and areas of artesian flow of the Floridan aquifer in Florida, July 6-17, 1961: Florida Geol. Survey Map Series No. 4. D. 1959 Study and interpretation of the chemical characteristics of natural water: U. S. Geol. Survey Water-Supply Paper 1473. 1961 Calculation and use of ion activity: U. S. Geol. Survey Water- Supply Paper 1535-C. Howard, C. S. (see Collins, W. D.) Jacob, C. E. 1950 Flow of ground water, chap. 5 in Rouse, Engineering hydraulics: New York, John Wiley and Sons. Johnson, Lamar 1961 Preliminary investigation and report on proposed impoundment areas in Southeast Green Swamp: Report by consulting engr. Kenner, W. E. 1964 Maps showing depths of selected lakes in Florida: Florida Geol. Survey Inf. Circ. 40. Kohler, M. S. 1959 (and Nordenson, T. J., and Baker, D. R.) Evaporation maps for the United States: U. S. Weather Bureau Tech. Paper 37. Kohout, F. K. 1959 (and Meyer, F. W.) Hydrologic features of the Lake Istokpoga and Lake Placid areas, Highlands County, Florida: Florida Geol. Survey Rept. Inv. 19. Knowles, D. B. (see Ferris, J. G.) Langbein, W. B. 1949 (and others) Annual runoff in the United States: U. S. Geol. Survey Circ. 52. Love, S. K. (see Parker, G. G.) Mansfield, W. C. (see Cooke, C. W.) 132