Second United Nations Congress on the Prevention of Crime and the Treatment of Offenders (London, 8-20 August 1960) : prevention of types of criminality resulting from social changes and accompanying economic development in less developed countries : part I : report by J. J. Panakal, Head of the Department of Criminology, Juvenile Delinquency and Correctional Administration, Tata Institute of Social Sciences, Bombay, India : part II : report by A. M. Khalifa, Director, National Center of Social and Criminological Research, Cairo, United Arab Republic