by Georg Joos ; with the collaboration of IRA M. Freeman. by Georg Joos, with the collaboration of Ira M. Freeman. Georg Joos ; with the collaboration of Ira M. Freeman. by V. Kourganoff, with the collaboration of I.W. Busbridge. Sir Hugh Ford ; part IV with the collaboration of J. M. Alexander. R. Creighton Buck, with the collaboration of Ellen F. Buck. by D. W. van Krevelen, with the collaboration of P. J. Hoftyzer. Compiled by J.I. Rodale with the collaboration of Edward J. Fluck. Honore Alphonse Joseph pieters. With the collaboration of J. W. Creyghton. Andr鈋 Weil, with the collaboration of Maxwell Rosenlicht.