Browning's Important Parleying - Stylistics across two centuries, Peter Porter (Firenze Leo S Olschki Editore MCMXCI), n.d. Box (Shared) Unit ID: 2.1 Date: n.d.
Letter from Peter Porter to Albert Hirst, 11 September 1969 Box (Shared) Unit ID: 1.13 Date: 11 September 1969
Letter from Peter Porter to Albert Hirst, 15 April 1968 Box (Shared) Unit ID: 1.6 Date: 15 April 1968
Letter from Peter Porter to Albert Hirst, 15 January 1968 Box (Shared) Unit ID: 1.5 Date: 15 January 1968
Letter from Peter Porter to Albert Hirst, 16 March 1967 Box (Shared) Unit ID: 1.1 Date: 16 March 1967