Atlas of Normal Radiographic Anatomy and Anatomic Variants in the Dog and Cat THRALL, DONALD E. (EMERITUS PROFESSOR, COLLEGE OF VETERINARY MEDICINE, NORTH CAROLINA STATE UNIVERSITY, RALEIGH, NORTH CAROLINA, RADIOLOGIST, IDEXX TELEMEDICINE CONSULTANTS, CLACKAMAS, OREGON),ROBERTSON, IAN D. (CLINICAL ASSOCIATE PROFESSOR, DEPARTMENT OF MOLECULAR BIOMEDICAL SCIENCES, COLLEGE OF VETERINARY MEDICINE, NORTH CAROLINA STATE UNIVERSITY)