細節
LB, Italy
Four coloured postcards, titled L'Obbiettivo, La Negativa, La Positiva, La Camera Obscura, each with undivided back and credited Giov. Mengoll - Bologna. (4)
Four coloured postcards, titled L'Obbiettivo, La Negativa, La Positiva, La Camera Obscura, each with undivided back and credited Giov. Mengoll - Bologna. (4)
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See colour plate 1