Hello,
Since I picked up the plate for Macomb yesterday, I decided to do a little research on copper plate engraving of topographic maps so that when we do a display, I will be able to write something about the technique. I found the following article that might be of interest to other libraries that are getting the plates:
Phillips, Hugh A. 1997. Copperplate Engraving for the Production of Topographic Maps at the United States Geological Survey 1890-1953. Meridian no. 11: 5-21.
Thought others might find it of interest. Linda Zellmer
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Linda Zellmer
Government Information & Data Services Librarian
Liaison to Natural & Physical Sciences & Agriculture
415 Malpass Library
Macomb, IL 61455
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Phone: 309-298-2723
Fax: 309-298-2791