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Rieke-Zapp, Dirk; Rosenbauer, Ralph; Rutishauser, Susanne; Reiterer, Alexander (2009). Historic Maps and Imagery for Modern Scientific Applications. Photogrammetrie, Fernerkundung, Geoinformation PFG, 2009(3), pp. 189-190. Stuttgart: Schweizerbart 10.1127/0935-1221/2009/0013
