"Optical Convention (2nd : 1912 : London, England)" . . . . . "Optical Convention (2nd : 1912 : South Kensington, London, England)" . . . "The proceedings of the Optical Convention, 1912. Held at South Kensington, June 19th to June 26th, 1912"@en . "The proceedings of the Optical Convention, 1912 Held at South Kensington, June 19th to June 26th, 1912"@en . "The proceedings of the Optical Convention : held at South Kensington, June 19th to June 26th, 1912"@en . . . . . . . . . . . "Conference proceedings"@en . "Conference papers and proceedings"@en . . .