In 1872, U.S. Consulate, Lucius Avery, in Camargo, Mexico, submitted circular no. 22 regarding the depositions of French citizens from the Alsace Lorraine region. I have only found dispatches from the Consulate's office in the National Archives digital collections, but have yet to locate circular no. 22 or the depositions mentioned.
I am currently working on my thesis about a French immigrant who lived in Camargo, Mexico between 1846 - 1882. He was from the Alsace Lorraine region and would most likely have been deposed.