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:

Nicholson The Guide to Files and Filing by Cooper Hand Tools, 2006

You can access the 1878 Edition here:

A Treatise on Files and Rasps by The Nicholson File Company, 1878

Thanks to the Evenfall Studios and their public domain Woodworks library