"The way in which the evidence of pre-Sargonic contact of the Indus civilization with Mesopotamia has been pushed into the background while making its chronological assessment and the way in which the sporadic material from the Bactria-Margiana complex ... has been dated to make that related to the end-phase of this civilization may be considered singularly interesting and indicative of a great mental block suffered by some archaeologists to accept the obvious and admit of the possibility of a considerably earlier beginning of the Indus civilization and its much larger duration."