These recommendations will be for reference materials I have found useful. It would be easy to just link to a search page of books by subject but I don't feel that would be very helpful.
Coin Reference Books
Coins of England and the United Kingdom 38th Edition
England's Striking History: An Introduction to the History of England and Its Silver Hammered Coins from the Anglo-Saxons to the English Civil War
Coins of England and the United Kingdom
British Coins Market Values
Art Reference Books
Turner: The Great Watercolours - The greatest watercolor artist to ever live!
Etchings of James McNeill Whistler (Dover Books on Fine Art)
Great Goya Etchings: The Proverbs, The Tauromaquia and The Bulls of Bordeaux (Dover Books on Fine Art)
Etching, Engraving and Other Intaglio Printmaking Techniques
The Complete Engravings, Etchings and Drypoints of Albrecht Durer
The Complete Etchings of Rembrandt: Reproduced in Original Size
Ceramics Reference Books