Copyright and License
How to credit OpenHistoricalMap
We do not require any OHM-specific credit separate from those required by the underlying data. Citations, however, are appreciated as "OpenHistoricalMap contributors"
For a browsable electronic map, OHM prefers the optional credits appear in the lower-right corner of the map. For example:
Finding out more
Read more about using our data, and how to credit us, at the OHM Licence page.
Our contributors are many, many individuals and organizations. We would not exist without their efforts.
- Contains data from various Natural Earth Data datasets.
- Contains data from the Newberry Library's Atlas of Historical County Boundaries.
- Contains data created by The Cambridge Group for the History of Population and Social Structures ANR Communes project.
For further details of these, and other sources that have been used to help improve OpenHistoricalMap, please see the Contributors page on the OpenHistoricalMap Wiki.
Inclusion of data in OpenHistoricalMap does not imply that the original data provider endorses OpenHistoriicalMap, provides any warranty, or accepts any liability.
OHM contributors are reminded never to add data from any copyrighted sources (e.g. Google Maps or printed maps) without explicit permission from the copyright holders.