Abstract
Summary: Geological reconnaissance calls for topographical maps. Where none are available, as was the case in the areas in the Solomon Islands where the author was working, the geologist may spend much time trying to provide his own. Aerial photographs not only enable topographical maps, of not very high but sufficient accuracy, to be made rapidly but also, especially under stereoscopic examination, are able to provide a large amount of guidance to the geologist on the ground. Four examples are given showing typical aerial photographs and the information derived from them, with some notes on the reliability found by subsequent work on the ground.

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