Correspondence received by Robert Leader (not from Anthony John Mundella), relating mainly to Liberal candidates and organisation of the electoral campaign on the 1879 By-election in Sheffield and South Yorkshire. Including letters from Henry Joseph Wilson (1-6, 12, 15, 18, 22, 32-33, 35, 42, 47, 49-50, 55, 59, 61, 63-64, 69, 73, 75, 77, 80, 83, 88, 91, 95, 106-107, 115-116, 118-119), printed copy of a letter from Anthony John Mundella on 'The Threatened Strike in Yorkshire' (7), John William Pye-Smith (13, 40), Sir Frederick Thorpe Mappin (14, 20-21, 65, 72, 79, 105, 113, 117), Samuel Danks Waddy (19, 24, 26, 36-37, 39, 44, 51-54, 67, 78, 92-93, 114, 122, 130-131), John Henry Barber (23, 123-124, 136), William Edward Forster (27-28, 31). John Arthur Roebuck (29, 34), George John Shaw-Lefevre (41, 58), Mark Firth (48), Charles Bradlaugh (86), Henry Wentworth-Fitzwilliam (96), W. Moore Ede (98-100, 103), Albert Grey, later Earl Grey (108), Henry Stephenson (110, 132), Alfred Bentley, principal of Firth College (111), Alfred Allott (120) and Auberon Herbert (137).