| RefNo | Title | Source |
| DF/ADM/1005/10 | Baylis, Dr Harry A | |
| DF/ZOO/200/63/13 | Baylis, Harry Arnold, 1889-1972 (Gosport) | |
| DF/ZOO/252/1/11/14 | Baylis, Harry Arnold (London) | |
| DF/ZOO/200/119/19 | Baylis, Harry Arnold | |
| DF/TM/3/11/47/7 | Baylis, H A | |
| DF/ZOO/200/65/10 | Baylis, Harry Arnold, 1889-1972 (Gosport) | |
| DF/ZOO/268/1 | Baylis, Harold Arnold: Correspondence and Papers | |
| DF/ZOO/232/5/14/2/7 | Baylis, H.A. | |
| DF/ZOO/232/5/13/1/16 | Baylis, H.A. | |
| DF/ZOO/232/5/22/1/9 | Baylis, Doctor H.A. | |
| DF/ZOO/232/6/12/2/5 | Baylis, Doctor H.A. | |
| DF/ZOO/232/6/13/1/7 | Baylis, Dr H.A. | |
| DF/ZOO/208/101 | Staff file: Baylis, Harry A | |
| DF/ZOO/268/1/2 | Correspondence of H A Baylis | |
| DF/ZOO/208/45 | Staff file: Baylis, Harry A | |
| DF/ZOO/232/6/11/1/16 | Baylis, Doctor H.A. | |
| DF/ZOO/200/61/12 | Baylis, Harry Arnold, 1889-1972 (Gosport) | |
| DF/PH/2/1/4/3 | Staff Group Photograph: 'The Establishment' (Full Staff Photograph) | |
| DF/PH/2/6/7/3 | Staff Group Photograph: Zoology Department | |
| DF/PH/2/6/7/2 | Staff Group Photograph: Zoology Department | |
| DF/ZOO/252/1/13/6 | Baylis, Harry Arnold (Gosport) | |
| DF/ZOO/252/1/14/9 | Baylis, Harry Arnold (Gosport) | |
| DF/ZOO/259 | Parasitic Worms Section Correspondence and Papers | |
| DF/ZOO/200/74/1 | Correspondence B (personal): File 1 | |
| DF/TRU/906/3 | Minutes of meetings of the Principal Trustees, with nomination and other papers | |
| DF/PH/2/1/4/4 | Staff Group Photograph: 'The Establishment' (Full Staff Photograph) | |
| DF/ZOO/218/16/10 | Zoological Accessions Register: Parasitic Worms, Record of Donations | |
| RS/2/23 | Dr Benjamin Dawes and Dr Harry A Baylis: correspondence | |
| DF/ADM/1000/99 | Reports and letters 1914 | |