File:PSM V67 D089 Outdoor geology lecture of the summer school.png
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![File:PSM V67 D089 Outdoor geology lecture of the summer school.png](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/PSM_V67_D089_Outdoor_geology_lecture_of_the_summer_school.png/612px-PSM_V67_D089_Outdoor_geology_lecture_of_the_summer_school.png?20111009162800)
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