author
b. 1869
Best known for a practical early 20th-century study of printmaking, this little-documented writer is remembered today through his surviving work in the public domain. His book offers a clear, craft-focused look at the technique and history of prints.

by Emil H. (Emil Heinrich) Richter
Very little biographical information about this author was readily confirmed from the sources I could find. He is listed by Project Gutenberg as Richter, Emil H. (Emil Heinrich), with a birth year of 1869.
He is associated with Prints: A Brief Review of Their Technique and History, a concise work on printmaking and its development. Because reliable author profiles appear to be scarce, it is safest to describe him as an early modern writer known mainly through this surviving publication rather than through a well-documented public biography.