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Douglass, AE. Anon.1914. A Photographic Periodogram of the Sun-Spot Numbers. The Astrophysical Journal, XL , no. No. 3. The Astrophysical Journal, .
Douglass, AE_A Photographic Periodogram of the Sun-Spot Numbers_1914.pdf (7.69 MB)
Douglas, AE_Indications of a Rainy Period in Southern Peru_1892.pdf (3.22 MB)