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  1. NLM Digital Collections - Index-catalogue of the Library of the Surgeon General's Office, United States Army (Series 4, ... 
    Publication: Washington : U.S. G.P.O., 1936-1948
    resource.nlm.nih.gov/8104688X10
    ... 1929, 11: 161.—Koplik, H. Percussion of the skull as a means of placing the indication for the performance of lumbar puncture; with special reference to its application in cerebrospinal meningitis of the ...