Bibliography

Frazão, Patrícia Franco et al.: The Postal Service of the Portuguese Expeditionary Corps (1917–1919): A Time-Step Analysis Using Historical Data Integration in a GIS Environment, in: Liebenberg, Elri / Demhardt, Imre Josef / Vervust, Soetkin (eds.): History of Military Cartography (Lecture Notes in Geoinformation and Cartography), Dordrecht 2016 Springer International Publishing, pp. 25-38.

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