May 1921 geomagnetic storm (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "May 1921 geomagnetic storm" in English language version.

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Dr Tony Phillips (January 21, 2009). "Severe Space Weather - Social and Economic Impacts". NASA. Retrieved December 18, 2012.
"Near Miss: The Solar Superstorm of July 2012". NASA Science. Archived from the original on 11 May 2024. Retrieved 11 May 2024.

"Aurora Borealis". Hawera & Normanby Star. May 16, 1921. p. 8. Retrieved December 18, 2012.

"Borealis Cause, Sun Spots, Will Diminish Today" (PDF). Chicago Daily Tribune. May 16, 1921. p. 4. Archived from the original (PDF) on August 12, 2014. Retrieved December 19, 2012.
"Sun Spots Vanishing" (PDF). The Los Angeles Times. May 16, 1921. pp. 1 & 2. Archived from the original (PDF) on August 12, 2014. Retrieved December 19, 2012.
"May 13, 1921 – The New York Railroad Storm". SolarStorms.org. Archived from the original on 28 September 2006. Retrieved 31 May 2020.
"Sunspot Aurora Paralyses Wires" (PDF). New York Times. May 15, 1921. pp. 1 & 3. Archived from the original (PDF) on October 22, 2013. Retrieved December 19, 2012.
"Cables Damaged by Sunspot Aurora" (PDF). New York Times. May 17, 1921. pp. 1 & 4. Archived from the original (PDF) on August 12, 2014. Retrieved December 19, 2012.

Phillips, Tony (12 May 2020). "The Great Geomagnetic Storm of May 1921". spaceweather.com. Retrieved 1 June 2020.

"Borealis Cause, Sun Spots, Will Diminish Today" (PDF). Chicago Daily Tribune. May 16, 1921. p. 4. Archived from the original (PDF) on August 12, 2014. Retrieved December 19, 2012.
"Sun Spots Vanishing" (PDF). The Los Angeles Times. May 16, 1921. pp. 1 & 2. Archived from the original (PDF) on August 12, 2014. Retrieved December 19, 2012.
"May 13, 1921 – The New York Railroad Storm". SolarStorms.org. Archived from the original on 28 September 2006. Retrieved 31 May 2020.
"Sunspot Aurora Paralyses Wires" (PDF). New York Times. May 15, 1921. pp. 1 & 3. Archived from the original (PDF) on October 22, 2013. Retrieved December 19, 2012.
"Cables Damaged by Sunspot Aurora" (PDF). New York Times. May 17, 1921. pp. 1 & 4. Archived from the original (PDF) on August 12, 2014. Retrieved December 19, 2012.
"Near Miss: The Solar Superstorm of July 2012". NASA Science. Archived from the original on 11 May 2024. Retrieved 11 May 2024.