Aurora of Mar. 22-25, 1920, and associated displays, by Charles F. Brooks and Herbert Lyman; Note on height and location of aurora spots and belt of Mar. 24, 1920, by Charles F. Brooks and C. LeRoy Meisinger; Physics of aurora, by W. J. Humphreys, abstract [by C. F. B.]; General auroral illumination of sky and wave-length of chief aurora line, by V. M. Slipher [abstracted by A. W.]; Aurora of Mar. 4-5, 1920; Auroras of 1919 in United States, by Herbert Lyman.

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