Letter from the 5th Earl of Cranbrook to the District Officr, Lumut, Perak seeking information on swiftlets and their nests in one of the Pulau Sembilan group of islands and also on arranging a boat trip to Simbilan islands

Letter from the 5th Earl of Cranbrook to the Editor, Ibis concerning lack of ultrasonic frequencies in the calls of swiftlets

Letter from the 5th Earl of Cranbrook to the Editor, Journal of the Bombay Natural History Society enquiring if the specimen of swiftlet mentioned by Col. E. A. Glennie in the J. Bombay Nat. Hist. Soc. 44: 593-597 (1944) was with the society. If so, the Earl would like to borrow it

Letter from the 5th Earl of Cranbrook to the Editor, The Emu, S. Marchant, enclosing a proposed article. Attached: i) "The nest of Collocalia v. vanikorensis, and the taxonomic implications" ii) handwritten notes on nests of Collocalia vanikorensis

Letter from the 5th Earl of Cranbrook to the Harbour Master, Telok Anson thanking him for allowing the Earl's friends to go Pulau Sembilan islands. The trip was well worthwhile. He mentioned his team captured an unusal rat and would like to return to the islands to catch a bigger one. He requested the Harbour Master to inform him if there was another boat going to the islands

Letter from the 5th Earl of Cranbrook to the Managing Director of the Gramaphone Company enquiring if the company had received the cheque for invoice no. 62588, and if the company had received his order of a pair of headphones suitable for use with RE. 321 Recorder

Letter from the 5th Earl of Cranbrook to the Pastor, Evangelical Church, Pontianak, Kalbar, Indonesia on birds nest caves near Putus Sibau, Kalimantan

Letter from the 5th Earl of Cranbrook to the Secretary, Bombay Natural History Society informing him he had posted the specimen of swiftlet obtained by Colonel Glennie. He described the specimen, and discussed about other species of Collocalia. Attached: description of specimen of swiftlet obtained by Colonel Glennie

Letter from the 5th Earl of Cranbrook to unknown person concerning a project for secondary school students to count swallows in Sarawak

Letter from the 5th Earl of Cranbrook to W. C. Harvey on nest-farming in Java. He also mentioned on the economics of swiftlet nests in Malaysia