What has the author Henry Stanley Ferns written?

It seems you're asking about an author named "Henry Stanley Ferns." There's no widely recognized author with that exact name. However, there are two prominent figures whose names are close to this:

* Henry Stanley (1841-1904): A famous journalist and explorer, best known for his expedition to find the missing explorer David Livingstone in Africa. He wrote several books about his experiences, including "How I Found Livingstone" (1872), "Through the Dark Continent" (1878), and "In Darkest Africa" (1890).

* H.S. Ferns (1917-2014): A British historian who wrote extensively on the history of British imperialism. His notable works include "Britain and Argentina in the Nineteenth Century" (1960), "The Age of Mackenzie King: The Rise of the Welfare State in Canada" (1955), and "The Birth of the Welfare State" (1961).

If you can provide more context or information about the author you're looking for, I might be able to provide a more precise answer.