%0 Journal Article %J The Astrophysical Journal, %D 1914 %T A Photographic Periodogram of the Sun-Spot Numbers %A Douglass, A.E. %K Douglass %K numbers %K periodogram %K photo %K photographic %K spot %K sun %K sun spot %B The Astrophysical Journal, %V XL %N No. 3 %0 Magazine Article %D 1892 %T Indications of a Rainy Period in Southern Peru %A Douglass, A.E. %K climate %K Douglass %K environment %K historic %K peru %K sun spot %B Science %V XX %N No. 507