My information came from a wide range of sources, but these were the main books:
Jewellery Making in Birmingham 1750–1995 by Shena Mason
The Jewellery Quarter, History and Guide by Marie Haddleton
Birmingham’s Jewellery Quarter by Alison Gledhill
Jewels of Our City: Birmingham’s Jewellery Quarter by Jean Debney
Hockley by David Harvey
Birmingham and the Midland Hardware District, ed. Samuel Timmins
Brief History of the Birmingham Pen Trade, Birmingham Pen trade Heritage Association
They Worked All Their Lives: Women of the Urban Poor 1880–1939 by Carl Chinn
Poverty Amid Prosperity: The Urban Poor 1834–1914 by Carl Chinn
Birmingham’s Industrial Heritage 1900–2000 by Ray Shill
A History of Birmingham by Chris Upton
The Girl from Hockley by Kathleen Dayus
Seeing Birmingham by Tram by Eric Armstrong
Finely Taught, Finely Wrought: The Birmingham School of Silversmithing 1890–1990, compiled by Barbara Newport
A Silversmith’s Manual by Bernard Cuzner
The Edwardians by Paul Thompson
Lost Voices of the Edwardians, ed. Max Arthur
By Hammer and Hand: The Arts and Crafts Movement in Birmingham by Alan Crawford
The Arts and Crafts Movement in Britain by Mary Greensted
A New Light on Tiffany: Clara Driscoll and the Tiffany Girls by Martin Eidelberg, Nina Gray and Margaret K. Hofer
Online silver forums at http://www.925-1000.com/forum/index.php?