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<br />4 <br /> <br />They classified and named the soils according to <br />nationwide uniform procedures. They drew the <br />boundaries of the soils on aerial photographs. These <br />photographs show trees, buildings, fields, roads, and <br />other details that help in drawing boundaries accurately. <br />The soil maps at the back of this publication were <br />prepared from aerial photographs. <br />The areas shown on a soil r~ap are callecl map units. <br />Most map units are made up of one kind of soil. Some <br />are made up of two or more kinds. The map units in this <br />survey area are described under "General s,)il map <br />units" and "Detailed soil map units." <br />While a soil survey is in progress, sample~; of some <br />soils are taken for laboratory measurements and for <br />engineering tests. All soils are field tested to determine <br /> <br />their characteristics. Interpretations of those <br />characteristics may be modified during the survey. Data <br />are assembled from other sources, such as test results, <br />records, field experience, and state and local specialists. <br />For example, data on crop yields under defined <br />management are assembled from farm records and from <br />field or plot experiments on the same kinds of soil. <br />But only part of a soil survey is done when the soils <br />have been named, described, interpreted, and delineated <br />on aerial photographs and when the laboratory data and <br />other data have been assembled. The mass of detailed <br />information then needs to be organized so that it can be <br />used by farmers, rangeland and woodland managers, <br />engineers, planners, developers and builders. home <br />buyers, and others. <br />