This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Duisburg population.svg en Duisburg population statistics since de Einwohnerentwicklung von Duisburg seit own data from de EinwohnerentwicklungvonDuisburg Gorgo File Duisburg population sv svg Created with Gnuplot gnuplot Ubuntu input set timefmt set datafile separator output unset key set style data lines set style fill