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Cover: In a quarry in Denmark, extensive fracture mapping and infrared thermography investigations of exposed Cretaceous chalk walls reveal a preferential flow pattern, which seems to be influenced by the regional setting. In "Infrared Thermography and Fracture Analysis of Preferential Flow in Chalk," Annette E. Rosenbom and Peter R. Jakobsen from the Geological Survey of Denmark and Greenland (GEUS) describe a valid and useful tool for distinguishing between hydraulically active and inactive fractures, p. 271-280.

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