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2. Identification of wild grasses and cereal pollen;Andersen;Danmarks Geologiske Undersøgelse Arborg,1979
3. Bilder vid vatten;Bengtsson,2004
4. To excavate images: some results from the Tanum rock art project, 1997–2004;Bengtsson,2010
5. Psimpoll Version 4.10: Computer Programme for Plotting and Analysis, Quaternary Geology, Earth Sciences;Bennett,2002