Ralph desposited some paperwork at Gloucester Archives - you may find what you are looking for there :-

archives AT gloucestershire.gov.uk
Gloucestershire Archives
Clarence Row
Alvin Street
GLOUCESTER GL1 3DW

http://www.nationalarchives.gov.uk/accessions/2006/06returns/06ac40.htm

•Ralph Anstis, historian: research papers on the Forest of Dean 1689-2005 (D10477)

Other works :-
•Fred M. Osborn, The Story of the Mushets, London, Thomas Nelson & Sons (1952)
•Ralph Anstis, Man of Iron - Man of Steel, ISBN 095113714X
•Keith Web, Robert Mushet and the Darkhill Ironworks, ISBN 1903599024