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S. Horace Draper Collection
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Con objetos digitales
Telescope complete, Dominion Astrophysical Observatory
Workers resting after completing telescope, Dominion Astrophysical Observatory
Dr Plaskett with completed telescope, Dominion Astrophysical Observatory
Dominion Astrophysical Observatory in operation
Dominion Astrophysical Observatory in winter
Dominion Astrophysical Observatory in winter