This paper describes a graphical correlation technique for relating mean winter precipitation in western Colorado to the topographic parameters; elevation, maxi mum slope of the land, exposure, and orientation. This is done by obtaining graphically values of precipitation as a function of elevation for various values of slope. Relating these values with orientation and thence exposure, a set of working charts is obtained. A high degree of correlation is shown to exist between the observed values of precipitation and those estimated from the charts.

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The solutions of many problems in applied climatology depend upon the further interpretation of available data through considerations of theory and a logical manipulation of the data. This paper describes an example of such a procedure whereby standard data summaries are arranged in a logical manner for a solution of the problem and, with further analysis based on background knowledge and theoretical concepts, reasonable estimates of values of unobserved parameters are attained.

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5dered military gcography obsolete. Increases in firc power afforded by nuclear and thermonuclear weapons, and progress in rocketry, have merely imposed a necessity for changes in tactics and organization, and for grcatly improved mobility and supply. Land warfare has not been rendered obsolete; one cannot assume that future warfare will be solely warfare of supply. Therefore, there remains a real need for a fully developed field of military geography. 0 0 0 ( I ) Bernard, hlerrill, "The Role of Climatology in Engineering,"