Appendix.

Maps showing the locations of instrument makers -- compiled by Lucy and Lance Whitehead

Thon's 1817 list of instrument makers (PDF) -- compiled by Lance Whitehead

Correlation of Instrument identifications in O'Brien 1990 and BMO (PDF) -- John Watson

The Spinets of the Hitchcock Dynasty (PDF May 2025 rev.) -- David Hackett 

Ferdinand Weber's Client Identification List (PDF) -- Lance Whitehead