Reference - Colne at the Paris exhibition

The visitor to the Paris Exhibition was Charles Colné. While Colné's early career was as a civil servant in Washington, he was the son of a glass maker and well prepared to comment on the glass industry.

Reports of the United States Commissioners to the Paris Universal Exposition, 1878.
Volume III: Iron and Steel, Ceramics and Glass, Forestry, Cotton.
Report on Glass by Mr. Charles Colné, page 243-387.

Washington: Government Printing Office, 1880.