What is the fine-grained topic of the following text: Ticinese in London 1847-1880: List from Continental Past: Ticinese Emigrants and their Cafe Restaurants in Britain, by Peter Barker and Peter Jacomelli, published by the Camden History Society, extracted from Kelly's Post Office Directories for central London. Only return the topic.
Ticinese Emigrants and their Cafe Restaurants in London from 1847-1880