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- Received 2 September 2015
- Accepted 6 December 2015
- Published 17 May 2016.
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- Previous version (17 May 2016 - 8:23am).
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© 2017 The Author(s)
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- 1Ellhornstrasse 21, 28195 Bremen, Germany
- 2Berliner Strasse 24, 39218 Schönebeck, Germany
- 3Geographisches Institut, Universität zu Köln, Albertus Magnus Platz, 50931 Köln, Germany
- ↵*Correspondence: burkhard.w.scharf{at}t-online.de
Scientific editing by Alan Lord