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(5) ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center, Astronaut View of Fires in Colorado, Digital Image, Earth Observatory, EOS Project Science Office, Nasa Goddard Space Flight Center, Maryland, USA, accessed 25 June 2019, <https://earthobservatory.nasa.gov/images/81485/astronaut-view-of-fires-in-colorado>
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(7) https://www.outsideonline.com/2330891/california-wildfire-pyrocumulus-clouds
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