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APA Citation
Unknown (n.d.). iSPRS Geospatial Week 2017. Photogrammetric record, 31, 255. http://access.bl.uk/ark:/81055/vdc_100033038539.0x000057
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Unknown (n.d.). iSPRS Geospatial Week 2017. Photogrammetric record, 31, 255. http://access.bl.uk/ark:/81055/vdc_100033038539.0x000057