Email from Lim Chan Koon to the 5th Earl of Cranbrook on newly moulted swiftlets with fresh glossy green feathers. They were very few with both green and blue feathers. His conclusion was that the green gloss and bluish-green gloss white-bellied swiftlets were of the same species. The difference in colour was due to the age of the feathers

Email from Lim Chan Koon to the 5th Earl of Cranbrook on the poor guarding system of the caves which resulted with the marked nests being stolen twice. He could not collect any scientific data, except feathers count

Email from Lim Chan Koon to the 5th Earl of Cranbrook on the student working on DNA comparisons in swiftlets

Email from Lim Chan Koon to the 5th Earl of Cranbrook saying that swiftlet house farmers in Peninsular Malaysia did not use egg-transfer method, but relied on sound recordings

Email from Lim Chan Koon to the 5th Earl of Cranbrook stating the weight of egg of Aerodramus fuciphagus was 1.81 ± 0.4g, n=56

Email from Lim Chan Koon to the 5th Earl of Cranbrook telling him of his new job. He also mentioned about swiftlet farming in Sarawak

Email from Mark Carterall to the 5th Earl of Cranbrook on data his team collected the previous year on swiftlets. He mentioned Collocalia esculenta in Buton and Aerodramus infuscatus in Kabaena island

Email from Mark Carterall to the 5th Earl of Cranbrook saying he would try to clarify the wholesale price of edible birds' nests in Buton. He also said he would send the Earl images of birds and nests. He also disclosed his postal address

Email from Nathan Johnson to the 5th Earl of Cranbrook concerning the introduction of Mariana Swiftlets to Oahu, Hawaii in 1962

Email from Nathan Johnson, graduate student from Oregon State University, who was working on the swiftlets of Hawaii, to the 5th Earl of Cranbrook asking him what was used to mark the cave wall on p. 36 of the book "Swiftlets of Borneo : Builders of Edible Nests" which was co-authored by the Earl