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Filtering by: Series Series 6: Glass Negatives Remove constraint Series: Series 6: Glass Negatives People Curtis, Heber Doust, 1872-1942 Remove constraint People: Curtis, Heber Doust, 1872-1942 Place Cerro San Cristóbal Remove constraint Place: Cerro San Cristóbal Topic Astronomical observatories Remove constraint Topic: Astronomical observatories

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