The entire, `lavishly' illustrated (graphic as only a medical text can be - you've been advised) book, in PDF format, with chapters specific to chickens/turkeys/domestic waterfowl, as well as nearly everything else. The first four chapters of Clinical Avian Medicine are also available. Best comprehensive reference I've found, yet. It went online in March of this year, so far as I know it is new to the web. http://avianmedicine.net/ (choose the READ INDIVIDUAL CHAPTERS option).