Filtering by: Type Image Remove constraint Type: Image 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 People D. O. Mills Observatory Remove constraint People: D. O. Mills Observatory Place Cerro San Cristóbal Remove constraint Place: Cerro San Cristóbal