Google map of sites of Captain Swing arson and threatening letters in northern England:
London SDF meetings advertised in Justice, 13 August 1887
SDF meetings advertised in Justice, 7 January 1888
SDF meetings London in Justice 4 August 1906
compiled SDF meetings in London
compiled SDF meetings in Manchester
suffragette meetings advertised in Votes for Women, 1909
WSPU meetings in London (1909, 1910)
Maps compiled by other people:
Gibbet sites, 1752-1834 – by the research team at www.criminalcorpses.com: