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Douglass, AE. 1923. “University Of Arizona Eclipse Expedition”. Popular Astronomy. Popular Astronomy.
PDF icon Douglass, AE_University of Arizona Eclipse Expedition_1923.pdf (3.33 MB)
Douglass, AE. 1923. “University Of Arizona Eclipse Expedition, Port Libertad, Sonora, Mexico”. Publications Of The Astronomical Society Of The Pacific XXXVI (No. 212). Publications Of The Astronomical Society Of The Pacific.
PDF icon Douglass, AE_The University of Arizona Eclipse Expedition, Port LIbertad, Sonora, Mexico_1923.pdf (12.3 MB)