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PHOTO INTERPRETATION PICTURE, COLWELL 
Fig.3. An example of the use of two terrestrial photographs taken from the 
same camera station, at the same time of year, but several years apart, to 
interpret changes in conditions in a glaciated area. Note the extent to which 
the glacier has receded during the interim and the vastly different terrain 
conditions that would now be encountered in the area that was formerly 
occupied by the glacial tongue. (Photo courtesy of Walther Hofmann.) 
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