Looking back on the 20th century.
Sawhney
K K
KK
D001432:Bacteriology / Q000266:history; D015510:Clinical Medicine / Q000266:history / Q000639:trends; D003952:Diagnostic Imaging / Q000266:history / Q000639:trends; D005544:Forecasting; D049673:History, 20th Century; D006801:Humans; D014612:Vaccines / Q000266:history
D014612:Vaccines