Copperwork

Free to read here, from Project Gutenberg.

Chats on Old Copper and Brass

Fred. W. Burgess

Copper Work: A Text Book for Teachers and Students in the Manual Arts

Augustus F. Rose

Mexican Copper Tools: The Use of Copper by the Mexicans Before the Conquest; and the Katunes of Maya History, a Chapter in the Early History of Central America, With Special Reference to the Pio Perez Manuscript.

Philipp J. J. Valentini