1. BT 31/18220/95023. Board of Trade: Companies Registration Office: Files of Dissolved Companies. Company No. 95023, Peruvian Amazon Company Ltd.
2. MS 5463/8. Note from H.L. Gielgud to Roger Casement, enclosing a letter to Charles Roberts.
3. MS 13073/7i/2-4. Letters to Roger Casement from Hal L. Gielgud.
4. MS 13073/20ii/1,15. Letters to Roger Casement from Louis H. Barnes.
5. MS 13073/24i/3-6. Letters to Roger Casement from H.L. Gielgud.