WA - Public Health 846 W - General Medicine. Health Professions 625 WB - Practice of Medicine 484 WO - Surgery 409 WM - Psychiatry 372 WS - Pediatrics 330 WC - Communicable Diseases 301 WU - Dentistry. Oral Surgery 288 WE - Musculoskeletal System 283 WQ - Obstetrics 240 WX - Hospitals and Other Health Facilities 231 WN - Radiology. Diagnostic Imaging 225 WW - Ophthalmology 211 WL - Nervous System 203 WG - Cardiovascular System 190 WP - Gynecology 188 WY - Nursing 181 WK - Endocrine System 178 WI - Digestive System 145 WD - Disorders of Systemic, Metabolic or Environmental Origin, etc. 143 WF - Respiratory System 141 WJ - Urogenital System 131 WV - Otolaryngology 131 WH - Hemic and Lymphatic System 124 WR - Dermatology 47 WT - Geriatrics 45 WZ - History of Medicine. Medical Miscellany 6