The Dooars in Historical Transition' is the first book on the Dooars reflecting its history of the antiquity most of the traces of which have not survived the ravages of time as well as of the medieval and modern times. Thus this book is the solitary attempt in the domain of historical researches to claim the credit of bringing into light the unknown remote past along with the narratives and analyses of historical transitions of the Dooars till today. The reader will be astonished to know from this book that in the seventh century the kingdom of Kamatapur was founded in the Dooars and after several centuries its capital was shifted to Gosanimari; and it was the same Dooars where for the first time was begun the Koch Kingdom with a capital to expand as a big empire in course of time. Along with this special narrative the other aspects of historical transitions in the socio-economic, political and cultural.