| RefNo | Title | Source |
| DF/ZOO/232/6/12/6/6 | Powell-Cotton, Major | |
| DF/TR/1/1/24/100 | Cotton, [Percy] [Horace] [Gordon] Powell- | |
| DF/ENT/332/1/75 | Norman D Riley papers: Major Percy H G Powell-Cotton, butterflies from the Congo and Uganda | |
| DF/TR/1/1/28/436 | Oswald, Ella | |
| DF/TM/1/55/6 | Correspondence C: Cotton; Powell-Cotton | |
| DF/TM/1/58/13 | Correspondence P: Porter; Poujade; Pouillon; Powell-Cotton; Power | |
| DF/TR/1/1/26/127 | Cotton, [Percy] [Horace] [Gordon] Powell- | |
| DF/ZOO/232/6/4/1/7 | Cotton, P.H.S. Powell | |
| DF/ZOO/230/121/51 | Kent: Powell-Cotton Museum, Birchington | |
| DF/TM/1/156/19 | Oversize correspondence: Perry; Perkins; Philippart; Powell-Cotton | |
| DF/TR/1/1/25/105 | Cotton, [Percy] [Horace] [Gordon] Powell- | |
| DF/ZOO/232/5/5/1/15 | Cotton, Major P.H.G. Powell- | |
| DF/TR/1/1/31/125 | Cotton, [Percy] [Horace] [Gordon] Powell- | |
| DF/ZOO/232/5/19/2/19 | Cotton, Major P H G Powell- | |
| DF/ZOO/232/5/20/2/21 | Cotton, Major P.H.G. Powell - | |
| DF/ZOO/232/5/21/2/8 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/11/2/16 | Cotton, Major P.H.G. Powell- | |
| DF/TR/1/1/32/103 | Cotton, [Percy] [Horace] [Gordon] Powell | |
| DF/ZOO/232/5/10/5/9 | [Margotati], James H. | |
| DF/ZOO/232/5/9/1/22 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/8/1/20 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/9/3/4 | Pinfold, G.F. | |
| DF/ZOO/232/5/10/2/1 | Calman, W.T. | |
| DF/ZOO/232/5/10/2/13 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/11/5/36 | Pinfold, G.F. | |
| DF/ZOO/232/6/6/2/1 | Blaine, G. | |
| DF/ZOO/232/6/6/9/9 | Powell-Cotton, Major | |
| DF/ZOO/232/5/12/2/11 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/13/2/1 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/14/3/1 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/15/4/1 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/16/3/20 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/17/3/1 | Cotton, Major P.H.G. Powell- | |
| DF/ZOO/232/5/18/4/1 | Cotton, Diana and Major P.H.Powell- | |
| DF/ADM/1004/580 | The Powell-Cotton Museum, Birchington, Kent: | |