00649cam a22002171 4500 med47000577 DLC 20260227111600.0 820128s1946 xx 000 0 eng med47000577 (OCoLC)14723125 DLC DNLM DLC premarc RC77 .P7 W6 P3 v.5744 Principles and technique of electroencephalography based on recent clinical research. [St. Louis, Dios chemical co., 1946] 23 p. ill. "Written by a registered physician for the medical profession." Dios Chemical Co. 38120 38120