A note on the art of mezzotint and mezzotint printing in colours (1900)
Dickins, A. C., author · Los Angeles, Cal. : Raymond C. Gould · leaf 15
The above illustrates the first stage of the mezzotinters work. It is the pencil drawing from the original picture, drawn to the scale required by the size of the plate.
Mezzotint engraving · Color prints
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.