These 4 letters concern Abel Yen's service to Manning and the use of his dictionary.

• Letter from Abel Yen to Thomas Manning after his recommendation by Elphinstone. He mentions Elphinstone and Ball and the dictionary in his possession. Undated, handwritten in Latin, 1 piece, 1 side
• Note from Abel Yen to Thomas Manning to accompany his dictionary. Undated, handwritten in Latin, 1 piece, 1 side
• Letter from Abel Yen to Thomas Manning. He mentions a letter from Ball. Undated. Handwritten in Latin, 1 piece, 1 side
• Letter from Abel Yen to Thomas Manning. Undated, Handwritten in Latin, 1 piece, 1 side.