Letters from William Henry Hudson to Philip Lutley Sclater regarding cuckoos, shipments of birds to the Smithsonian, Woodpeckers in Argentina, Blackbirds and other birds

Correspondence between the Foreign Office and the Zoological Society of London regarding the shipment of a Maned Wolf from Senor Luciano Romero Corrales of Corrientes, Argentina

Correspondence with Gerald Durrell regarding animals to be deposited at London Zoo, the exchange of Gough Island Moorhens for a pair of Rheas, a publication by the International Union for the Preservation of Nature on extinct and vanishing birds, a trip to Argentina, the diet of Giant Pangolins, and the care of Notornis

Correspondence with Geoffrey Marr Vevers regarding the sale of animals from Argentina and Chile to the Zoological Society of London

Correspondence between Alan Best and Geoffrey Marr Vevers regarding a collection of stock from Argentina required for the Zoological Society of London, also four Sealions from New York