| Downloaded from https://forobs.jrc.ec.europa.eu/products/gam/download.php on June 7, 2023. | |
| ESRI Grid file format. | |
| Nelson, A. (2008) Estimated travel time to the nearest city of 50,000 or more people in year 2000. Global Environment Monitoring Unit - Joint Research Centre of the European Commission, Ispra Italy. Available at https://forobs.jrc.ec.europa.eu/products/gam/ (accessed 07/06/2023) |