| Image Caption | Research note by Constable concerning 'Lago Albano and Castel Gandolfo' in Birmingham City Art Gallery, August 1950. |
| Recto and verso of a photograph of 'Lago Albano and Castel Gandolfo' in Birmingham City Art Gallery, showing research notes of Constable (& others) on the painting, c1950. |
| Research note by Constable concerning 'Lago Albano and Castel Gandolfo' in the Lady Lever Art Gallery, c1940s-1950s |
| Recto and verso of a photograph of 'Lago Albano and Castel Gandolfo' with Gooden & Fox, showing Constable's research notes on the painting, November 1950. |