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002197 e. Unit values as determined by the method outlined in 3d above were re- corded on a diagrammetric layout of the projection covering a partic- ular area, after which a total was obtained for the drainage area in question. 4. Tabulated breakdown of areas, as indicated in paragraph 2 above, are given in follOWing table form, pages 66 to 8,3, inclusive 0 GENERAL INFORMATION AS TO THE DE~IINATION OF RIVER MILFAGES SHOWN River mileages were determined from the latest available Corps of Engi- neers survey maps of the streama, supplemented by surveys for reservoir areas. If stream or reservoir survey maps were not available, then mileages were oom- piled from the latest published maps, such as those prepared by the U. S. Geological Survey, M:I,ssissippi River Commission, National Forest Service, Bureau of , Soils - U.S.D.A., etc. As a matter of specific information the source of certain mileages is as follows: (1) Main stem of the Wh:l,te River. - From the mouth to mile 285 near Newport, Arkansas, the river miles are as shown on the Mississippi River Conunission quadrangles. Ji'rom mile 285 to mile 404 near Cotter, Arkansas, the mileages were determined from the White River 1940 Survey Maps (Cotter to Batesville) prepared by the Corps of Engineers. From mile 404 to about mile 625 near Beaver, Arkansas, river miles were determined from the Bull Shoals and Table Rock Reservoir maps prepared by the Corps of Engineers. Above the Table Rook Reservoir maps the mileage was determined from the U. S. Geological Survey quadrangles. (2) Blaok River. - River miles deternuned from the Mississippi River Commission quadrangles from the mouth to about mile 23l, from U. S. Geological Survey quadrangles from about mile 23l to mile 252 and from the Clearwater Reservoir maps prepared by Corps of Engineers for the reach above mile 252. E