7 books
The Making of the Modern Police, 1780-1914, Part II vol 4
The Making of the Modern Police, 1780-1914, Part II vol 5
The Making of the Modern Police, 1780-1914, Part II vol 6
The Making of the Modern Police, 1780-1914, Part II
The Ascent of the Detective
Ascent of the Detective, The: Police Sleuths in Victorian and Edwardian England
The Making of a Policeman