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Illustraded programme of the Royal Jubilee Procession (published in Aid of the Prince of Wales' Hospital Fund for London)
Some electrical instruments at the Faraday centenary exhibition, 1931 (by Robert W. Paul, M.I.E.E., F.INST.P.)
Conférences publiques sur la photographie théorique et technique (Conservatoire national des arts et métiers ; par M. Charles Gravier,...)