Human Powered Flying
A book by Chris Roper B. Eng., the designer and builder of the HPA Jupiter (pictured above) and the human powered hovercraft Steam Boat Willy on the history of human powered flight from the early 20th Century to the present day. 

The book can be read online by navigating the menu in the top left-hand corner of this site

It can also be downloaded as a pdf here and on the downloads page