The Nicholson File Company has been producing guides to the use of files since at least 1878. Here are links to both one of the earliest and one of the latest versions of their guidance.
These documents should be of interest to all hobby and model engineers.
This 2006 version of their guidance, by Cooper Hand Tools in the USA has been put into the public domain:
You can access the 1878 Edition here:
Thanks to the Evenfall Studios and their public domain Woodworks library
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