| Pietro Poppi Cloud study [Studi di Nube. Fotog dell'Emilia Bologna) 1888-1890 Gelatin silver bromide, Glass plate 21.1 x 27 cm Cassa di Risparmio Foundation Inventory no: 10165 LL/103355 (Alan Griffiths, 11 August 2020) I'm indebted to Cinzia Frisoni for bringing this photograph to my attention.
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