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Douglass, AE. 1907. The Illusions Of Vision And The Canals Of Mars. Popular Science Monthly. Popular Science Monthly.
PDF icon Douglass, AE_The Illusions of Vision and the Canals of Mars_1907.pdf (11.87 MB)
PDF icon Douglass, AE_Indicaciones sobre un periodo Iluvioso en el Sur del Peru_1892.pdf (4.51 MB)
PDF icon Douglas, AE_Indications of a Rainy Period in Southern Peru_1892.pdf (3.22 MB)
Webb, GE. 1978. The Infatigable Astronomer. The Journal Of Arizona History. The Journal Of Arizona History.
PDF icon Ferguson_Interim Progress Report Dendrochronology of Bristlecone Pine_1968.pdf (3.19 MB)
PDF icon Ferguson_Interim Report on the Dendrochronology of Bristlecone Pine Prior to 4,000 B.C._1966.pdf (2.65 MB)