189Reasons given were the summer bvacation/b and the end of the fiscal year (Garfield to Lederberg,. June 9, 1960). 190Garfield to Lederberg, Jun 24, 1960. Garfield included ?almost all? changes Allen had recom- mended (Garfield to Allen, June 24, 1960). b....../bbTollebeek/b, J. (1996), De ekster en de kooi, Uitgeverij Bert Bakker. Tukey, J. W. (1962), 'Keeping research in contact with the literature: Citation indices and beyond',. Journal of Chemical Documentation 2, 34?37. ...