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Ulf Helldén and Lars Eklundh
Lund University Press , Chartwell-Bratt 1988 Lund studies in geography Ser. C . General, mathematical and regional geography ; no. 15
: Sweden , : England
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by Ulf Helldén
Lund University Press , Chartwell-Bratt 1987 Lund studies in geography Ser. C . General, mathematical and regional geography ; no. 14
Laboratory of Remote Sensing, Dept. of Physical Geography, University of Lund , In cooperation with Institute of Environmental Studies, University of Khartoum 1984 Rapporter och notiser 61
Available at 1 libraries