Na Galipedia, a wikipedia en galego.
This map's source is here, with the uploader's modifications, and the GMT homepage says that the tools are released under the GNU General Public License.
Prussian Silesia, 1871, outlined in yellow; (Austrian) Silesia before the annexion by Prussia in 1740, outlined in cyan. Map showing post-1994 state borders.
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http://en.wikipedia.org/wiki/Image:HistoricSilesiamap.png
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