Alexander Bruy - ebooki
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QGIS:Becoming a GIS Power User. Master data management, visualization, and spatial analysis techniques in QGIS and become a GIS power user
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QGIS 2 Cookbook. Become a QGIS power user and master QGIS data management, visualization, and spatial analysis techniques
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QGIS By Example. Leverage the power of QGIS in real-world applications to become a powerful user in cartography and GIS analysis