During more than half a century, from 1972 onwards, Nicholas Sims-Williams has published many important articles on the older Iranian languages, especially Eastern Middle Iranian (Sogdian, Bactrian and Khotanese). Virtually all of his articles on Sogdian and Khotanese are collected in the present volume, together with three entirely new papers entitled "Is there a 'predicative instrumental' in Sogdian?", "Yaghnobi and the Sogdian 'Rhythmic Law'" and "The locative singular in Old Khotanese". The additions and corrections which have become necessary as a result of fifty years of progress in the understanding of these languages are provided throughout, but carefully distinguished from the original text, making it easy to locate references to the earlier versions. The book is completed with detailed indexes and will be an essential reference for students and scholars interested in Central Asian history and literature as well as in Iranian and Indo-European linguistics.