Karten
- Geogreif
- Perry-Castañeda Library Map Collection (University of Texas at Austin)
- Historische Karten - Staats- und Universitätsbibliothek Bremen
- IEG Maps - Server für digitale historische Karten
- European Soil Data Centre (ESDAC) - Maps & Documents
- Euratlas - History and Geography of Europe and the World
- Foundation for East European Family History Studies (FEEFHS ) - Map Library