English: Map of Derbyshire, England, showing the distribution of Rubus durescens, an endemic microspecies whose entire world population occurs only here. Symbols represent presence within 10 x10km squares.
Date
Source
Own work (Replacement image will be uploaded shortly)
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
New file no longer contains map background data for which I was not confident at the time that I had copyright permission for use and therefore to upload.