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. In many cases the required source maps are current and available; however, in some cases the source map manuscript requires revision prior to utilization as a base for the County Maps. In still other circumstances it will be neces- sary to first produce the appropriate source map and then construct the County Map. it should be noted that thE' neat lines of the source maps and the County Maps m~y not always coincide. FUNDING County Map production is cooperatively funded by USGS and the State of Colorado, the latter through the Colorado Division of Planning. ADVANTAGES Several advantages will accrue to the Colorado map-using community when the County Maps are completed, thus: o Comprehensive coverage. Completion of this new series will mean that, for the first time, the State of Colorado will be mapped with up-to- date, general-purpose, accurate, topographic maps having a uniform medium scale. At present, the only complete coverage is at 1:250,000 scale and the 1:24,000-scale series is slightly less than 75 percent complete. o Accuracy. County Maps will comply with national standards of map accuracy. o Uniform editions. On a state-wide basis, no one map in this new series will have an edition date that is more than four years older than any other map in the series. On a county-wide basis, no one map of a county will have an edition date that is more than one year older than any other map l)[ that county in this series. o Currency of information. All County Maps will bear the edition date of the production year and the information content will be consistent with that edition date. In every case the information content of the County Map will be more current than that of the published source map. o Utility. County Maps are general-purpose maps large number and wide variety of special uses. is exceptionally appropriate for comprehensive which can be put to a The 1:50,000-scale and regional planning. o Flexibility. County Maps are designed in a manner which facilitates reduction and admits enlargement. They can be reprinted (on special order only) in a variety of combinations consistent with the color- separation printing process. For example, planimetric maps can be produced by eliminating the (brown) contour line drawing. Mylar film positives of the color-separation drawings can be made available (again on special order only) in at least two thicknesses (.004 and .007 inch) on at least two surfaces (clear and matte) and in at least two variations (reverse and direct reading). These mylars can be printed singly or in combination.