Nr 193 - Fourth International Congress of Neurological Surgery, N.Y. 20-27 1969. ; Nr 194 - Problems, of psychosis.Montreal,5-8 1969. ; Mr 195 - Urea and the kidney. Florida, 9-12 1968. 1970
Card's contents:512,508 Nr 193 - Fourth International Congress of Neurological Surgery, N.Y. 20-27 1969. 516,546 Nr 194 - Problems, of psychosis.Montreal,5-8 1969. 514,074 Nr 195 - Urea and the kidney. Florida, 9-12 1968. 1970