The getCollection arguments are appended to the api call as such:
&getCollection={name}
The possible arguments are:
Aberdeen University Museum
Abingdon Museum
American Numismatic Society
Amiens
AshmoleanAshwell Village Museum
Basle
Bedford Museum
Bibliotheque Nationale
Bibliotheque Royale
Birmingham Museum and Art Gallery
Bonn
Boulogne
Bridport Museum and Art Gallery
Brighton Museum
Bristol City Museum
British Museum
Buckinghamshire County Museum
Canterbury Museum
Chelmsford Museum
Cheltenham
Chichester District Museum
Clermont-Ferrand
Colchester and Essex Museum
Corinium Museum
Coventry Museum
Deal Museum
Devizes Museum
Dorchester (Dorset County Museum)
Douai
Dover Museum
Edinburgh (Royal Scottish Museum)
Epping Forest District Museum
Fitzwilliam Museum
Gloucester City Museum and Art Gallery
Grosvenor Museum
Hampshire County Museums Service
Harlow Museum
Hastings
Hertford Museum
Hull and East Riding Museum
Hunterian Museum
Ipswich Museum
Karlsruhe
King’s Lynn Museum
Leeds City Museum
Leeds University Museum
Leicestershire Museum and Art Gallery
Leiden
Letchworth Museum and Art Gallery
Lincoln City and County Museum
Liverpool Museums and Art Gallery
Luton Museum and Art Gallery
Lyon
Maidstone Museum and Art Gallery
Mainz
Manchester University Museum
Munich
Musee de Bretagne
Musee de Peronne
Museum of London
Museum of Sussex Archaeology
Museum of the Iron Age
Namur
Nantes
National Museum
National Museum of Wales
National Museums of Scotland
Newbury District Museum
Northampton Museum and Art Gallery
Norwich Castle Museum
Nottingham Castle Museum
Nottingham University Museum
Oxford Archaeological Unit
Passmore Edwards Museum
Peterborough Museum and Art Gallery
Pitt Rivers Museum
Plymouth Museum and Art Gallery
Portsmouth Museum and Art Gallery
Powell-Cotton Museum
Private collection
Reading Museum
Red House Museum
Richborough Castle
Rochester Museum
Roman Baths Museum
Rouen
Royal Mint
Royal Ontario Museum
Russell Cotes Museum
Saarbrucken Museum
Saffron Walden Museum
Salisbury and South Wiltshire Museum
Scarborough Museum
Scunthorpe Borough Museum and Art Gallery
Shaftsbury Museum
Shakespeare’s Birthplace Trust
Sheffield City Museum
Shrewsbury Museum and Art Gallery
Soissons
Southend Museum
Stockholm
Stow on the Wold Museum
Stroud Museum
Stuttgart Museum
Swindon Museum and Art Gallery
Taunton Castle Museum
The Hague
Thurrock Local History Museum
Ulster Museum
Verulamium Museum
Wakefield Museum
Warwickshire Museum
Winchester City Museum
Woodstock Museum
Worcester City Museum
Worthing Museum
Yorkshire Museum
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