The visual requirements of military aviators. 1917.
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D000337:Aerospace Medicine / Q000266:history*; D005060:Europe; D049673:History, 20th Century; D006801:Humans; D008889:Military Personnel / Q000266:history*; D014481:United States; D014786:Vision Disorders / Q000175:diagnosis / Q000266:history; D014787:Vision Tests / Q000266:history*; D014792:Visual Acuity