The great emphasis placed on aerial photography and photographic interpretation in the past 5 years is difficult to appreciate except for those directly concerned with the war effort. For tens of photographs taken in the pre-war years, thousands have been taken during the war years. This vast increase resulted from the urgent need for accurate intelligence data, charts, and maps and was made possible by the remarkable surge of American airpower. Such an increase can not fail to have a profound influence on the relation of post-war aerial photography to geology.

The mechanical improvement and availability of aircraft suitable for...

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