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Methods: We derive near-infrared dust extinction maps for 23 molecular cloud complexes, using the \"nicest\" colour excess mapping technique and data from the 2MASS archive. The extinction maps are then used to examine the column density PDFs in the clouds. Results: The column density PDFs of most molecular clouds are well-fitted by log-normal functions at low column densities (0.5 mag < A_v < 3-5 mag). 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