Authors
Informal description
Attribution and linkback requested.
Year
2014
Data format
PNG images
Licence text
Using this graphic and referring to it is encouraged,
and please use it in presentations, web pages, newspapers,
blogs and reports.
For any form of publication, please include the link to
this page and give the cartographer/designer credit.
Links
Further information
See also the XML record for this licence and the general notes on copyright.