Volume of x-ray visits: United States--April-September 1970.
D000293:Adolescent; D000328:Adult; D000368:Aged; D003710:Demography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D011861:Radiography, Dental; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014481:United States