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Douglass, AE. 1899. “A Summary Of Planetary Work At The Lowell Observatory And The Conditions Under Which It Has Been Performed”. Popular Astronomy. Popular Astronomy.

Douglass, AE_A Summary of Planetary Work at the Lowell Observatory and the Conditions Under Which It Has Been Performed_1899.pdf (11.4 MB)

Douglass, AE. 1910. “Drawings Of A Comet”. Popular Astronomy. Popular Astronomy.

Douglass, AE_Drawings of a Comet_1910.pdf (1.86 MB)

Douglass, AE. 1897. “Atmosphere, Telescope And Observer”. Popular Astronomy. Popular Astronomy.

Douglass, AE_Atmosphere, Telescope and Observer_1897.pdf (27.67 MB)