The history of sonographers.
Baker
Joan P
JP
Diagnostic Ultrasound Program, Bellevue Community College, Bellevue, WA, USA.
D016390:Allied Health Occupations / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D012952:Societies / Q000266:history; D014463:Ultrasonography / Q000266:history*