| RefNo | Title | Date |
| NLB/23/1/736 | Copy letter from Robert William Frederick Harrison, to Professor John Alexander MacWilliam, [Fellow of the Royal Society], the University, Aberdeen | 13 January 1902 |
| NLB/23/1/439 | Copy letter from Robert William Frederick Harrison, to Professor John Alexander MacWilliam, Physiological Laboratory, The University, Aberdeen | 13 November 1901 |
| NLB/23/1/780 | Copy letter from Robert William Frederick Harrison, to Professor John Alexander MacWilliam, The University, Aberdeen, North Britain | 13 January 1902 |
| RR/25/28 | Referee's report by Arthur Robertson Cushny, on a paper 'The mechanism and control of fibrillation in the mammalian heart' by John Alexander MacWilliam | [1918] |
| NLB/53/133 | Copy letter from [William Bate] Hardy, Secretary of the Royal Society and FRS; to Professor J. A. MacWilliam, FRS, Physiological Laboratory, Marishal College, Aberdeen | 4 May 1916 |
| NLB/55/841 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [John Alexander] MacWilliam, FRS | 14 October 1918 |
| EC/1916/13 | MacWilliam, John Alexander: certificate of election to the Royal Society | |
| PP/12/11 | Paper, 'On the rhythm of the mammalian heart' by J A [John Alexander] MacWilliam | 1888 |
| PP/12/19 | Paper, 'On the effects of increased arterial pressure on the mammalian heart' by J A [John Alexander] MacWilliam | 1888 |
| PP/6/15 | Paper, 'On the structure and rhythm of the heart in fishes, with especial reference to the heart of the eel' by J A [John Alexander] MacWilliam | 1885 |
| PP/6/5 | Paper, 'On reflex excitation of the cardiac nerves in fishes' by J A [John Alexander] MacWilliam | 1884 |
| PP/12/19/1 | Manuscript, 'On the effects of increased arterial pressure on the mammalian heart' by J A [John Alexander] MacWilliam | 1888 |
| PP/12/19/2 | Diagrams, heartbeats by J A [John Alexander] MacWilliam | 1888 |
| PP/17/28 | Paper, 'A new test for albumin and other proteids' by J A [John Alexander] MacWilliam | 1891 |
| PP/21/13 | Paper, On the influence exercised by the central nervous system on the cardiac rhythm, with an inquiry into the action of chloroform on that rhythm'' by J A [John Alexander] MacWilliam | 1893 |