Letter from R. W. Sims to the 5th Earl of Cranbrook concerning the Earl's notes on swiftlets of the Niah and Baram caves. He has sent the notes to Deignan in Washington

Letter from R. W. Sims to the 5th Earl of Cranbrook enclosing his recent corresondences with Dr Kenneth C. Parkes. He discussed the difficulty of identifying species of swiftlets

Letter from R. W. Sims to the 5th Earl of Cranbrook informing his notes had been returned from Deignan in Washington. He also discussed Deidnan's work.

Letter from R. W. Sims to Tom Harrisson concerning the specie of swiftlets that build wet mossy-nests. He also discussed other different species of swiftlets

Letter from Richard K. Brooke to the 5th Earl of Cranbrook concerning Salangana

Letter from Richard K. Brooke to the 5th Earl of Cranbrook concerning Salangana

Letter from Richard King to the 5th Earl of Cranbrook telling him edible nests had not been traded in Shanghai since around 1970. He also mentioned he had seen edible bird nest soup sold in restaurants or the three main foreigners' hotels

Letter from Robert Awene stating that the 5th Earl of Cranbrook and Lim Chan Koon had permission to conduct research in Bau caves

Letter from Robin to the 5th Earl of Cranbrook informing him of what Dr Stanley Temple said about the bird nest industry in Mauritius

Letter from Roger C to the 5th Earl of Cranbrook concerning sound recordings and specimens of Collocalia. He sought advice from the Earl on Tarsiers in Malaysia