This is a most interesting and useful move by the American Daffodil Society :
"The American Daffodil Society is proud to provide this eBook with permission of the author. More eBooks will be made available in the future.
Yellow Fever, A Prospect of the History and Culture of Daffodils, 2012, by David Willis
Yellow Fever is a book about the history of the daffodil growing mainly in the United Kingdom and Ireland and it covers all the most important personalities around the world and their achievements that have made the daffodil the important spring garden flower that is is today."