Article Peter Smithurst (2016)
Thomas Firth and Sons — Steelmakers to the Arms Industry Part 1 — Smallarms — Enfield, Government Contractors and Others. Arms and Armour Society Journal (pp. 143-156). (/isis/citation/CBB494573193/) unapi

Article Dan Trepal (2009)
The Gun Foundry Recast. IA. The Journal of the Society for Industrial Archeology (pp. 73-90). (/isis/citation/CBB613420081/) unapi

Article William Sisson (1992)
A Revolution in Steel: Mass Production in Pennsylvania, 1867-1901. IA. The Journal of the Society for Industrial Archeology (pp. 79-93). (/isis/citation/CBB136236915/) unapi

Article Terry S. Reynolds (1989)
A Narrow Window of Opportunity: The Rise and Fall of the Fixed Steel Dam. IA. The Journal of the Society for Industrial Archeology (pp. 1-20). (/isis/citation/CBB855460391/) unapi