Correspondence between the Duke of Bedford and Geoffrey Marr Vevers regarding the importation of Kangaroos from Australia, Pere David Deer at Whipsnade, the transfer of Deer to New York Zoo, and New Zealand Brown Ducks in the Waders Aviary. Also a biography of the 11th Duke of Bedford

Correspondence between Edward Smith-Stanley, Earl of Derby, and David William Mitchell regarding a list of desirables from the sale catalogue of the aviary and menageries at Knowsley Hall

Final memorandum on the unveiling of a plaque at the homing budgerigar aviary on 18 April 1955

Correspondence between the Zoological Society of London and Buckingham Palace on topics such as admission tickets for the Gardens at Regent's Park and Whipsnade Park, the election of Vice-Presidents at the Zoological Society of London, the naming of the Snowdon Aviary, reports of the Annual General Meeting and Council meetings and luncheons for the Duke of Edinburgh

Licences and plans of proposed London Zoo buildings, many of which were temporary structures, or not eventually built. Includes: large map of London Zoo in 1911 with position of proposed shelter marked, and plans of shelter, 1914; plans of proposed new aviary, 1906; plan of temporary shelters for HM The King's Indian Collection, 1912; plan of Proposed Wood & Iron Addition to the Prosector's Building, 1904; layout of Poultry Culture Exhibition, 1917; fire certificate Tea Pavilion Mappin Terraces, 1914; fire certificate Main Offices, 1910; temporary buildings extension, 1934. 

Discussions on plants for the Aviary