You can download Pathology of Pet and Aviary Birds 2nd Edition by R. E. Schmidt, D. R. Reavill and D. N. Phalen free in pdf format.
Pathology of Pet and Aviary Birds, Second Edition provides a comprehensive reference to the gross and histologic features of diseases seen in pet and aviary birds, with more than 850 images depicting disease lesions. Provides a complete resource for identifying both common and not-so-common diseases in a wide range of avian species. Includes more than 850 full-color images to show disease lesions. Offers context for the interpretation of pathologic findings, promoting an understanding of the pathogenesis and epizootiology of disease. Adds information on pigeons and chickens, pathophysiology, prognosis and trends, and globally relevant diseases. Aids pathologists, diagnosticians, and avian veterinarians in identifying lesions in pet birds