1. AFHRA (Air Force Historical Research Agency). https://www.afhra.af.mil, accessed January 2020.
2. AgiSoft MetaShape Professional (Software version 1.6.5) (2020). Agisoft LLC, St. Petersburg.
3. ArcGIS Desktop: Release 10.8.1. (2020). ESRI (Environmental Systems Research Institute), Redlands, CA.
4. ASPRS (American Society for Photogrammetry and Remote Sensing) (2008). LAS Specification Version 1.2. https://www.asprs.org/wp-content/uploads/2010/12/asprs_las_format_v12.pdf, accessed January 2021.
5. Baldoli, C., Knapp, A., and Overy, R. (2011). Bombing, States and Peoples in Western Europe, 1940–1945. Continuum, Norfolk, UK.