1. Association for Unmanned Vehicle Systems International—AUVSIwww.auvsi.org
2. Commercial Drone Market Size, Share & Trends Analysis Report By Application (Filming & Photography, Inspection & Maintenance), by Product (Fixed-Wing, Rotary Blade Hybrid), by End Use, and Segment Forecasts, 2019–2025,2019
3. McCook Field 1917–1927;Johnson,2002
4. Determining the prevalence of certain cereal crop diseases by means of aerial photography