IGY Visual Aurora Program - observations and correspondence. Material from Geoff Gaherty, RASC Montreal Centre.
Aurora Borealis: Display of August 21, 1917, JRASC 11,365 (Nov. 1917, Plate XVI) by A. Steadworthy.
Aurora Borealis: Display of August 21, 1917, JRASC 11,365 (Nov. 1917, Plate XV) by A. Steadworthy.