Letter from Theresa Clay to the 5th Earl of Cranbrook on identification of ectoparasites of Collocalia lowi (=Aerodramus maximus) at Niah: Paracimax avium, Paracimex sp. , Denyus sp. , Myophthiria reduviodes

Letter from Theresa Clay to the 5th Earl of Cranbrook on Mallophaga of Collocalia

Letter from Tom Harisson (signed on his behalf by J. Edwards) to MacDonald, the Keeper, Bird Room, British Museum (Natural History) concening swiftlets Collocalia maxima and Collocalia salanga deposited at museum by the Earl

Letter from Tom Harrisson to the 5th Earl of Cranbrook giving consent to the Earl to use photographs. He also discussed his visit to United States and on meeting Mayr and Sibley. The meetings developed further ideas on the swift feeding and the mist netting scheme

Letter from Tom Harrisson, Curator of Sarawak Museum to Dr F. B. Bang on swiftlets. He also requested for exact instructions

Letter from Tom Harrisson, Curator, Sarawak Museum to the Ian Urquhart, District Officer, Marudi, Baram concerning discrepancy in the quantity of white bird nests auctioned at Long Lama and the quantity exported from 1950 to 1955

Letter from Tun Yin to the 5th Earl of Cranbrook concerning edible nest harvests of Burma. He enclosed extracts from a paper "Edible birds' nest: marine products of commerce" presented at an oceanography Science conference held at Rangoon in April 1970

Letter from unknown person to Ian Urquhart, District Officer, Marudi, Baram on the bird-nests auction carried out on 11th January 1964 at Long Lamah

Letter from unknown person to Johnson Sudok Luat, Sarawak Administrative Officer, Lubok Antu requesting for help from Mr Peter Tinggom

Letter from unknown person to the 5th Earl of Cranbrook on birds of the Seychelles