Books by London International congress of photography. 7th:
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International congress of photography. 7th, London, (1928): Proceedings of the seventh International congress of photography, London, July 9-14, 1928. (W. Heffer & sons, limited, 1929), also by Bertram Vincent Storr, T. Slater Price, Walter CLark, and William Jackson Pope (page images at HathiTrust)
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